BRUSSELS, BELGIUM - DECEMBER 19: Belgian Prince Philippe, Princess Mathilde and their daughter Princess Elisabeth attend the engagement announcement of Belgian Prince Laurent and Claire Coombs at the Laeken Royal Palace December 19, 2002 in Brussels, Belgium. The couple will be married April 12, 2003. (Photo by Mark Renders/Getty Images)
BRUSSELS, BELGIUM - AUGUST 22: In this handout photo, Princess Mathilde, Prince Philippe, their daughter Elisabeth and newborn son Prince Gabriel of Belgium pose for a portrait on August 22, 2003 in Brussels, Belgium. Prince Gabriel was born on August 20, 2003 at 1 o'clock in the morning. (Photo courtesy of the Royal Palace via Getty Images)
DOCHAMPS, BELGIUM - JULY 16: Prince Philippe, Princess Mathilde of Belgium and their children (oldest-youngest) Princess Elisabeth, Prince Gabriel and Prince Emmanuel of Belgium play in Park Chlrophylle on July 16, 2007, in Dochamps Belgium. (Photo by Pool /Getty Images)
ANTWERP, BELGIUM - JUNE 30: Princess Mathilde with baby Eleonore of Belgium visits the Antwerp Zoo on June 30, 2008 in Brussels, Belgium. (Photo by pool/Getty Images)
BRUGELETTE, BELGIUM: King Philippe - Filip of Belgium, Princess Eleonore, Prince Gabriel, Queen Mathilde of Belgium, Crown Princess Elisabeth and Prince Emmanuel look at the elephants during a photoshoot of the Belgian Royal Family's vacation at animal park Pairi Daiza in Cambron-Casteau, Brugelette, Saturday 11 July 2015. © Olivier Polet (Photo by Olivier Polet/Corbis via Getty Images)
