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.