THE HAGUE, NETHERLANDS - APRIL 29: Prince Constantijn, Princess Laurentien, Countess Eloise, Count Claus-Casimir and Countess Eleonore arrive at Palace Noordeinde for an private birthday party for King Willem-Alexander in the Royal Stables on April 29, 2017 in The Hague, Netherlands. (Photo by Patrick van Katwijk/Getty Images)
