Prince Nikolai of Denmark Graduated from the prestigious Herlufsholm School in Naestved, Denmark on June 27, 2018

(L-R) Denmark's Prince Nikolai put his arm around his stepmother's back Princess Marie as they posed with his father Prince Joachim during his high school graduation ceremony in Naestved, Denmark

Countess Alexandra of Frederiksborg pictured with sons Prince Nikolai, 18, left, and Felix, 15, right, whom she shares with Prince Joachim. The couple divorced in 2005

Prince Joachim of Denmark was married twice, with his first wife Alexandra, Countess of Frederiksborg left, and second wife Princess Marie of Denmark

The royal couple Prince Joachim and Princess Marie of Denmark both donned sunglasses for the outdoor event

Prince Nikolai of Denmark, 18, second from left, was joined by his parents, Prince Joachim, right, and Countess Alexandra of Frederiksborg, left, and stepmother Princess Marie as he graduated from the prestigious Herlufsholm School in Næstved, Denmark, on Wednesday, June 27, 2018

Denmark's Prince Joachim and Princess Marie arrived at the boarding school for the graduation of Prince Nikolai (not pictured).

Proud father Prince Joachim of Denmark and son Prince Nikolai appeared to share a joke, much to Princess Marie's amusement.

(R-L) Denmark's Prince Joachim along with his wife Princess Marie looked delighted to see his eldest son Prince Nikolai at his graduation

Prince Nikolai of Denmark graduate cap wearing congratulations from his father, mother, and brother on June 26, 2018, on his very last day at Herlufsholm School, on the eve of the graduation ceremony

(2nd-R) Prince Nikolai of Denmark photographed with his mother Countess Alexandra of Frederiksborg, his brother Prince Felix and his father Prince Joachim on his very last day at the Herlufsholm School on the eve of his Graduation ceremony on June 26, 2018

Prince Nikolai of Denmark photographed on the eve of his graduation ceremony.

Countess Alexandra of Frederiksborg at the funeral of Prince Henrik of Denmark on February 20, 2018, in Copenhagen.

Countess Alexandra of Frederiksborg at the funeral of Prince Henrik of Denmark on February 20, 2018, in Copenhagen.

Countess Alexandra of Frederiksborg at the funeral of Prince Henrik of Denmark on February 20, 2018, in Copenhagen.

Prince Nikolai of Denmark on the presence of his father Prince Joachim, his mother Countess Alexandra of Frederiksborg (white dress) and her stepmother Princess Marie of Denmark (black dress) at his graduation ceremony at the private school of Herlufsholm.

(R-L) Prince Joachim of Denmark with his wife Princess Marie of Denmark and his ex-wife Countess Alexandra of Frederiksborg pose for a photo during High School graduation ceremony of his eldest son Prince Nikolai (not pictured).

Countess Alexandra of Frederiksborg left, and Princess Marie of Denmark, 2nd-right, is understood to enjoy a good relationship pictured with Prince Joachim of Denmark on right, as they attend the graduation ceremony of Prince Nikolai not pictured.

(L-R) Countess Alexandra of Frederiksborg with Princess Marie of Denmark and Prince Joachim of Denmark as they attend the graduation ceremony at the private school of Herlufsholm in Denmark

Countess Alexandra of Frederiksborg with older son Prince Nikolai of Denmark at his graduation ceremony at the private school of Herlufsholm.

(C) Countess Alexandra of Frederiksborg in a pretty pink and black pattern white dress as she attends her eldest son high school graduation in Naestved, Denmark

Countess Alexandra of Frederiksborg with his eldest son Prince Nikolai of Denmark during his high school graduation ceremony in Naestved, Denmark

Prince Nikolai of Denmark on the presence of his father Prince Joachim, his mother Countess Alexandra of Frederiksborg (white dress) and her stepmother Princess Marie of Denmark (black dress) at his graduation ceremony at the private school of Herlufsholm.

(R-L) Prince Joachim of Denmark with his wife Princess Marie of Denmark and his ex-wife Countess Alexandra of Frederiksborg pose for a photo during High School graduation ceremony of his eldest son Prince Nikolai (not pictured).

(L-R) Princess Marie of Denmark with husband Prince Joachim of Denmark, who greets his ex-wife Countess Alexandra of Frederiksborg during Prince Nikolia of Denmark's high school graduation ceremony in Naestved, Denmark

Countess Alexandra of Frederiksborg opted for a pretty pink and black pattern white dress as she attends her eldest son high school graduation in Naestved, Denmark

Prince Joachim of Denmark with his current wife Princess Marie of Denmark (R) and his ex-wife Countess Alexandra of Fredirksborg (L)  posed for a photo at his eldest son high school graduation in Naestved, Denmark

Proud mother Countess Alexandra of Frederiksborg with older son Prince Nikolai of Denmark at his graduation ceremony at the private school of Herlufsholm.

Prince Nikolai of Denmark on the presence of his father Prince Joachim, his mother Countess Alexandra of Frederiksborg (white dress) and her stepmother Princess Marie of Denmark (black dress) at his graduation ceremony at the private school of Herlufsholm.

Prince Joachim of Denmark with his current wife Princess Marie of Denmark (R) and his ex-wife Countess Alexandra of Fredirksborg (L)  posed for a photo at his eldest son high school graduation in Naestved, Denmark

(R-L) Prince Joachim of Denmark with his wife Princess Marie of Denmark and his ex-wife Countess Alexandra of Frederiksborg pose for a photo during High School graduation ceremony of his eldest son Prince Nikolai (not pictured).

Prince Joachim of Denmark with his current wife Princess Marie of Denmark (R) and his ex-wife Countess Alexandra of Fredirksborg (L)  posed for a photo at his eldest son high school graduation in Naestved, Denmark

Proud mother Countess Alexandra of Frederiksborg with older son Prince Nikolai of Denmark at his graduation ceremony at the private school of Herlufsholm.

(C) Countess Alexandra of Frederiksborg in a pretty pink and black pattern white dress as she attends her eldest son high school graduation in Naestved, Denmark

Prince Nikolai of Denmark, second from left, was joined by his parents, Prince Joachim, right, and Countess Alexandra of Frederiksborg, left, and stepmother Princess Marie of Denmark as he graduated from the prestigious Herlufsholm School in in Naestved, Denmark, on June 27, 2018

Countess Alexandra of Frederiksborg pose for a photo during her eldest son graduation ceremony from the prestigious Herlufsholm School in in Naestved, Denmark

(L-R) Countess Alexandra of Frederiksborg and Princess Marie of Denmark hugs as they greet each other as Prince Joachim of Denmark looks as they attend Prince Nikolai's graduation ceremony from the prestigious Herlufsholm School in in Naestved, Denmark

Prince Joachim of Denmark with his current wife Princess Marie of Denmark (R) and his ex-wife Countess Alexandra of Fredirksborg (L)  posed for a photo at his eldest son graduation from the prestigious Herlufsholm School in in Naestved, Denmark

(C) Countess Alexandra of Frederiksborg in a pretty pink and black pattern white dress as she attends her eldest son high school graduation in Naestved, Denmark

Countess Alexandra of Frederiksborg in Copenhagen on May 27, 2018.

Prince Nikolai of Denmark and his mother Countess Alexandra of Frederiksborg on August 28, 2017 in Copenhagen for Prince Nikolai's 18th birthday dinner.

Prince Joachim of Denmark, Prince Nikolai, Countess Alexandra of Frederiksborg and Prince Felix on August 28, 2017 in Copenhagen for Prince Nikolai's 18th birthday dinner.

(L-R) Princess Marie of Denmark, Prince Joachim of Denmark, Prince Henrik of Denmark, Princess Athena of Denmark, Prince Nikolai of Denmark, Countess Alexandra of Frederiksborg and Prince Felix of Denmark attend the 18th birthday celebration of Prince Nikolai at royal ship Dannebrog on August 28, 2017 in Copenhagen, Denmark.

(L-R) Princess Marie of Denmark, Prince Joachim of Denmark, Prince Henrik of Denmark, Princess Athena of Denmark, Prince Nikolai of Denmark, Countess Alexandra of Frederiksborg and Prince Felix of Denmark attend the 18th birthday celebration of Prince Nikolai at royal ship Dannebrog on August 28, 2017 in Copenhagen, Denmark.

(L-R) Princess Marie of Denmark, Prince Joachim of Denmark, Prince Henrik of Denmark, Princess Athena of Denmark, Prince Nikolai of Denmark, Countess Alexandra of Frederiksborg and Prince Felix of Denmark attend the 18th birthday celebration of Prince Nikolai at royal ship Dannebrog on August 28, 2017 in Copenhagen, Denmark.

(L-R) Princess Marie of Denmark, Prince Joachim of Denmark, Prince Henrik of Denmark, Princess Athena of Denmark, Prince Nikolai of Denmark, Countess Alexandra of Frederiksborg and Prince Felix of Denmark attend the 18th birthday celebration of Prince Nikolai at royal ship Dannebrog on August 28, 2017 in Copenhagen, Denmark.

(L-R) Prince Nikolai of Denmark his mother Countess Alexandra of Frederiksborg and younger brother Prince Felix of Denmark during his 18th birthday celebration at royal ship Dannebrog on August 28, 2017 in Copenhagen, Denmark.

Danish Queen Margrethe II Celebrates Her 78th Birthday at the Palace on April 16, 2018 in Copenhagen, Denmark.

The late Prince Henrik, pictured in 2017, was married to Queen Margrethe II of Denmark for over 50 years, until his death on 13 February 2018.

Queen Margrethe II of Denmark all smiles, marked her 78th birthday in Copenhagen on Monday. She has been on the throne since January 1972

Crown Prince Frederik was not seen on the palace balcony on Monday-April 16, 2018, but his wife and their four children were at his mother's side on her birthday from left to right: Princess Isabella, Princess Josephine, Crown Princess Mary of Denmark, Prince Vincent and Prince Christian.

Crown Princess Mary, wearing a red dress, stood proudly behind her children, (left to right) Princess Isabella, twins Princess Josephine and Prince Vincent, and Prince Christian

Queen Margrethe II of Denmark beamed and waved to the crowds from the balcony of the palace, as she marked her 78th birthday in Copenhagen

Queen Margrethe II of Denmark wore a vibrant blue blouse beneath a pin-striped belted jacket and matched her earrings to her blue top

Queen Margrethe II was seen smiling at her seven-year-old grandson, Prince Vincent (front-left) on the palace balcony alongside with her other grandchildren Princess Isabella (back left), Prince Felix and Princess Athena (R)

(L-R) Denmark's Princess Josephine, Princess Isabella, Prince Christian, Prince Vincent, Crown Princess Mary, Queen Margrethe II, Princess Marie, Prince Nikolai, Princess Athena, and Prince Henrik pose on the balcony of Amalienborg palace during the Danish Queen's 78th Birthday celebrations on April 16, 2018, in Copenhagen, Denmark.

Denmark's Queen Margrethe, who turned 78 on Monday, seen center, was joined on the balcony by (from left) Princess Josephine, Princess Isabella, Crown Princess Mary, Prince Vincent, Prince Christian, Princess Marie, Prince Joachim (just seen), Princess Athena, Prince Felix, Prince Nikolai, and Prince Henrik

Princess Josephine of Denmark, wearing a tweed coat dress and with a smart navy blue band in her hair on the balcony of Amalienborg Palace to marked her grandmother Queen Margrethe II 78th birthday in Copenhagen

Crown Princess Mary looked glamorous in a red dress, surrounded by her children from left to right: Princess Isabella, the twins Princess Josephine and Prince Vincent, and Prince Christian

(L-R) Playful Princess Josephine cheekily covered her eyes as her brothers and sister waved from the balcony, Princess Isabella, Crown Princess Mary, Prince Christian and Prince Vincent of Denmark

Princess Josephine of Denmark, wearing a tweed coat dress and with a smart navy blue band in her hair, did eventually offer a wave - albeit with a very solemn expression on her face

Dapper Princes Josephine's twin brother Prince Vincent (below left) delivered an angelic performance for the cameras, while his mother Crown Princess Mary (center left) and grandmother Queen Margrethe II were snapped smiling proudly at him and his older brother

Well-wishers gathered at the palace in Copenhagen waved Danish flags as they cheered for their Queen Margrethe II on her 78th birthday

(L-R) Princess Josephine is seen with her older sister, Princess Isabella on the balcony of Amalienborg Palace in Copenhagen.

The seven-year-old Princess Josephine appeared to stifle a yawn at one point as the royal family posed for photographs on the balcony of the palace in Copenhagen

(L-R) Princess Josephine's antics were eventually spotted by her laughing older sister, Princess Isabella, who quickly urged her younger sibling to uncover her eyes, while the twin brother Prince Vincent delivered an angelic performance for the cameras

Prince Christian appeared to gently remove something from his little brother Prince Vincent's face behind them is their mother Crown Princess Mary of Denmark

Denmark's Prince Christian lent his younger brother Prince Vincent a helping hand at one point after he apparently caught something in his eye

The Queen's younger son Prince Joachim (far right), was joined on the balcony by his wife Princess Marie (far left), their children Princess Athena (second from left, in front), and Prince Henrik (third from left, in front), and Joachim's children from his first marriage; 18-year-old Prince Nikolai (third from left, behind), and 15-year-old Prince Felix (second from right)

Crown Princess Mary of Denmark together with her children from left-right Princess Josephine, Princess Isabella, Prince Christian and Prince Vincent appears at the balcony of the Royal residence, Amalienborg Palace, on the occasion of her 78th birthday of Queen Margrethe of Denmark on April 16, 2018, in Copenhagen, Denmark.

Crown Princess Mary of Denmark, Prince Christian of Denmark, Princess Isabella of Denmark, Prince Vincent of Denmark and Princess Josephine of Denmark pose on the balcony of Amalienborg palace during Queen Margrethe of Denmark's 78th Birthday celebrations 2018 in Copenhagen, Denmark.

(R-L) Queen Margrethe of Denmark, Crown Princess Mary of Denmark, Prince Christian, Princess Isabella,  Princess Josephine and Prince Vincent pose on the balcony of Amalienborg palace during the Danish Queen's 78th Birthday celebrations 2018 in Copenhagen, Denmark.

(R-L) Crown Princess Mary of Denmark with her children Prince Christian of Denmark, Princess Isabella of Denmark, Prince Vincent of Denmark and Princess Josephine of Denmark pose on the balcony of Amalienborg palace during Queen Margrethe of Denmark's 78th Birthday celebrations 2018 in Copenhagen, Denmark.

(R-L) Crown Princess Mary of Denmark with her children Prince Christian of Denmark, Princess Isabella of Denmark, Prince Vincent of Denmark and Princess Josephine of Denmark pose on the balcony of Amalienborg palace during Queen Margrethe of Denmark's 78th Birthday celebrations 2018 in Copenhagen, Denmark.

Crown Princess Mary of Denmark with her sons Prince Christian of Denmark, Princess and Prince Vincent of Denmark at the balcony of Amalienborg Palace in Copenhagen, Denmark

(R-L) Denmark's Queen Margrethe, Crown Princess Mary, Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine at the balcony of Amalienborg Palace in Copenhagen, Denmark. The Queen of Denmark celebrates her 78th birthday at the Palace.

Queen Margrethe of Denmark with grandchildren from left-right Prince Vincent, Princess Isabella, Prince Felix, Prince Christian and Princess Athena at the balcony of Amalienborg Palace in Copenhagen, Denmark. The Queen of Denmark celebrates her 78th birthday at the Palace.

(R-L) Crown Princess Mary of Denmark with her children Prince Christian of Denmark, Princess Isabella of Denmark, Prince Vincent of Denmark and Princess Josephine of Denmark pose on the balcony of Amalienborg palace during Queen Margrethe of Denmark's 78th Birthday celebrations 2018 in Copenhagen, Denmark.

(R-L) Denmark's Prince Christian, Princess Isabella, Princess Josephine and Prince Vincent at the balcony of Amalienborg Palace in Copenhagen, Denmark.

(R-L) Denmark's Queen Margrethe, Crown Princess Mary, Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine at the balcony of Amalienborg Palace in Copenhagen, Denmark. The Queen of Denmark celebrates her 78th birthday at the Palace.

(L-R) Denmark's Princess Josephine, Princess Isabella, Prince Vincent, Prince Christian, Crown Princess Mary, Queen Margrethe II, Princess Marie, Prince Nikolai, Princess Athena and Prince Henrik at the balcony of Amalienborg Palace, to mark The Queen of Denmark 78th birthday in Copenhagen.

Queen Margrethe of Denmark marks her 78th birthday surrounded by her family from right to left Princess Marie, Crown Princess Mary, Prince Christian and Prince Vincent at the balcony of Amalienborg Palace in Copenhagen, Denmark.

Crown Princess Mary of Denmark with children Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine pose on the balcony of Amalienborg palace during Queen Margrethe of Denmark's 78th Birthday celebrations on April 16, 2018, in Copenhagen, Denmark.

Crown Princess Mary of Denmark with children Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine pose on the balcony of Amalienborg palace during Queen Margrethe of Denmark's 78th Birthday celebrations on April 16, 2018, in Copenhagen, Denmark.

Crown Princess Mary of Denmark with children Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine pose on the balcony of Amalienborg palace during Queen Margrethe of Denmark's 78th Birthday celebrations on April 16, 2018, in Copenhagen, Denmark.

(R-L) Denmark's Queen Margrethe, Crown Princess Mary, Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine at the balcony of Amalienborg Palace in Copenhagen, Denmark. The Queen of Denmark celebrates her 78th birthday at the Palace.

(R-L) Queen Margrethe of Denmark, Crown Princess Mary of Denmark, Prince Christian of Denmark and Prince Vincent of Denmark pose on the balcony of Amalienborg Palace during the Danish Queen's 78th Birthday celebrations on April 16, 2018, in Copenhagen, Denmark.

(R-L) Denmark's Queen Margrethe, Crown Princess Mary, Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine pose on the balcony of Amalienborg palace during the Danish Queen's 78th Birthday celebrations 2018 in Copenhagen, Denmark.

(R-L) Denmark's Queen Margrethe, Crown Princess Mary, Prince Christian, Princess Isabella, Prince Vincent and Princess Josephine pose on the balcony of Amalienborg palace during the Danish Queen's 78th Birthday celebrations 2018 in Copenhagen, Denmark.

Denmark's Crown Princess Mary looked glamorous in a red dress, surrounded by her children Prince Christian and Prince Vincent (front) pose on the balcony of Amalienborg palace during the Danish Queen's 78th Birthday celebrations 2018 in Copenhagen, Denmark.

Queen Margrethe II of Denmark wore a vibrant blue blouse beneath a pin-striped belted jacket, and matched her earrings to her blue top, as she marked her 78th birthday without her spouse of 50 years, beaming and waving from the balcony of Amalienborg Palace surrounded by loved ones.

Queen Margrethe of Denmark at the balcony of Amalienborg palace on April 16, 2018, in Copenhagen, Denmark. The Queen of Denmark celebrates her 78th birthday at the Palace.