Princess Letizia

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Princess Letizia of Spain poses at Zarzuela Palace on Sept. 15, 2012, in Madrid. The princess marked her 40th birthday that day.

Princess Letizia of Spain and children, Princesses Leonor and Sofia, pose at Zarzuela Palace on Sept. 15, 2012, in Madrid.

Princess Letizia and her husband, Prince Felipe of Spain, pose at Zarzuela Palace on Sept. 15, 2012, in Madrid.

Princess Letizia of Spain poses at Zarzuela Palace on Sept. 15, 2012, in Madrid.

Princess Letizia of Spain, Prince Felipe of Spain and their children, Princesses Leonor and Sofia, pose at Zarzuela Palace on Sept. 15, 2012, in Madrid.

Pictures: The Spanish royal family

Princess Letizia and Prince Felipe of Spain pose at Zarzuela Palace on Sept. 15, 2012, in Madrid.

150115587.jpg_sp4.jpg — Pascal Le Segretain/Getty Images

Prince Felipe and Princess Letizia of Spain attend the men's basketball semifinal match between Spain and Russia during the London 2012 Olympic Games on Aug. 10, 2012, in London.

Princess Letizia of Spain attends the Inaugural Dinner for the XVII US-Spain Council Forum on June 22, 2012, in Jersey City, N.J.

Princess Letizia of Spain attends Easter Mass at the Cathedral of Palma de Mallorca on April 8, 2012, in Palma de Mallorca, Spain.

The Spanish Royal Family attends Spain's National Day Reception at the Royal Palace on Oct. 12, 2011, in Madrid. From left are King Juan Carlos, Queen Sofia, Prince Felipe, Princess Letizia, Prince Elena, Princess Cristina and Inaki Urdangarin.

Spain's Crown Prince Felipe, center, tands for a minute of silence with Princess Letizia, right, and Spain's Foreign Minister Trinidad Jimenez during a commemorative ceremony in Madrid on Sept. 11, 2011. The ceremony was to mark the 10th anniversary of the terrorist attacks in New York, Washington, D.C. and Pennsylvania.

Spain's Prince Felipe is flanked by Princess Letizia, right, and Spain's Queen Sofia, left, outside of Westminster Abbey at the royal wedding for Britain's Prince William and Kate Middleton in London, April, 29, 2011.

Spain's Prince Felipe and Princess Letizia attend a pre-royal wedding gala dinner, hosted by Queen Elizabeth II's cousin, Lady Elizabeth Anson, at the Mandarin Oriental hotel on April 28, 2011, in London.

Spain's Princess Letizia and Prince Felipe pose together at an official dinner honoring Britain's Prince Charles at the Palacio Real de Madrid on March 30, 2011, in Madrid.

From left, first lady Michelle Obama, Queen Sofia of Spain and Princess Letizia of Spain at the Marivent Palace on Aug. 8, 2010, in Palma de Mallorca, Spain.

French President Nicolas Sarkozy, right, makes a toast with Princess Letizia during a gala dinner at the Royal Palace in Madrid on April 27, 2009.

Spanish Queen Sofia, right, and Princess Letizia with her daughter Leonor are seen aboard the yacht Somni, during the 27th King's Cup sailing race in Palma de Mallorca, Spain, July 30, 2008.

Princess Letizia of Spain presents Princess Sofia to the Virgen of Nuestra Senora de Atocha on Sept. 19, 2007, in Madrid.

Crown Prince Felipe of Spain brings a smile to the face of his wife, Princess Letizia, as they present their daughter Princess Sofia to the Virgen of Nuestra Senora de Atocha on Sept.19, 2007, in Madrid.

The Archbishop of Madrid, Cardinal Antonio Maria Rouco Varela, left, baptizes Sofia, the daughter of Spain's Princess Letizia, centre, and Crown Prince Felipe, using water from the River Jordan, alongside the mother of Princess Letizia, Paloma Rocasolano, right, at the Zarzuela Palace just outside of Madrid, Sunday July 15, 2007.

Spain's Princess Letizia is comforted by King Juan Carlos as they depart from the crematorium of Tres Cantos after the funeral of her younger sister Erika Ortiz near Madrid, Feb. 8, 2007.

Spain's Crown Princess Letizia cries as she remembers her sister Erika Ortiz, after attending her youngest sister's cremation at La Paz cemetery in Madrid, Feb. 8, 2007. Ortiz, 31, was found dead in the bedroom in her Madrid apartment.

Spain's Crown Prince Felipe, right, and Princess Letizia, left, pose with their daughter Princess Leonor in Madrid Oct. 30, 2006. Princess Leonor's celebrated her first birthday the next day.

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Spain's Crown Prince Felipe de Bourbon walks next to his bride, Princess Letizia Ortiz after their wedding ceremony in Almudena cathedral May 22, 2004, in Madrid.