Leonor, Princess of the Asturias, Celebrates Her 12th Birthday on October 31, 2017 in Madrid, Spain

Leonor, Princess of the Asturias poses for an official portrait to commemorate her 12th birthday on October 31, 2017 in Madrid, Spain

(L-R) Queen Letizia of Spain with her daughters Princess Leonor and Infanta Sofia, even as pre-schoolers the girls were already showing off their now-famous twinning style! They wore matching blue dresses and cardigans as they attended their first-ever joint photocall before Easter Mass on the island of Mallorca, Spain, in April 2009.

The charismatic young Princess Leonor of Spain flashes a huge grin during a Madrid royal engagement in 2016. She is first in line to the Spanish throne, Princess Leonor was born on October 31, 2005 at the Ruber International Clinic in Madrid. The future queen is the first child of King Felipe VI and Queen Letizia, a former TV news anchor who married the then-Crown Prince in 2004.

Princess Leonor of Spain is seen with her dad King Felipe VI of Spain on a summer visit to the Can Prunera Museum in Palma de Mallorca in 2017.

From left to right 2nd row Spain's King Felipe VI and wife Queen Letizia with their daughters Princess Leonor and Infanta Sofia. - Leonor's title at birth was Her Royal Highness Infanta Leonor of Spain, but when her father Crown Prince Felipe ascended the throne to become King Felipe VI, the young royal inherited the title for the heir to the throne – Her Royal Highness The Princess of Asturias. The young Princess was definitely ready for her close-up at her dad's coronation in Madrid on June 19, 2014. 

Spanish Queen Letizia, who looked casual in a sleeveless striped vest with white linen trousers and beaded sandals, with her older daughter Princess Leonor wore a sweet pleated white dress at the Marivent Palace on the island of Mallorca, where the family are spending their annual summer holiday in August 2016. Both mom and daughters also love affordable brands including Spanish labels Mango and Zara.

(L-R) Spanish Princess Leonor with her parents King Felipe VI and Queen Letizia and her sibling Infanta Sofia during a photoshoots in honor of her mother Queen Letizia's 40th birthday in 2012 at Zarzuela Palace

The little royal was baptized in the church at the family home in Madrid, Zarzuela Palace, on January 14, 2006 with her parents Crown Princess Letizia and Crown Prince Felipe VI of Spain. Princess Leonor’s godparents are her paternal grandparents, King Juan Carlos on left, who served as Spain's monarch from 1975 until his abdication in 2014, and his wife Queen Sofia on right. During the ceremony, proud grandmother Queen Sofia remarked to reporters that her granddaughter was not only beautiful, but also well-behaved.

Princess Leonor of Spain attends Santa Maria de los Rosales school, where her father was once a student, in the Madrid suburb of Aravaca. Eventually she will likely study abroad as her father did. She has studied Mandarin, French and Arabic – in addition to Spanish, regional languages and her already fluent English.