BRUSSELS, BELGIUM - JUNE 02: Prince Amadeo, Princess Louisa Maria, Princess Maria Laura, Princess Astrid, Princess Louise, King Albert, Prince Aymeric, Prince Nicolas, Prince Laurent, Princess Claire, Queen Paola and Prince Lorentz of Belgium assist Princess Astrid's 50th birthday at Schonenberg Residence on June 2, 2012 in Brussels, Belgium. (Photo by Belgium Royal Pool/Getty Images)

BRUSSELS, BELGIUM - JUNE 02: Prince Amadeo, Princess Louisa Maria, Princess Maria Laura, Princess Astrid, Princess Louise, King Albert, Prince Aymeric, Prince Nicolas, Prince Laurent, Princess Claire, Queen Paola and Prince Lorentz of Belgium assist Princess Astrid's 50th birthday at Schonenberg Residence on June 2, 2012 in Brussels, Belgium. (Photo by Belgium Royal Pool/Getty Images)