BRUSSELS, BELGIUM - JUNE 02: Princess Laetitia Maria, Princess Maria Laura, Princess Astrid, King Albert, Prince Laurent, Princess Claire, Prince Aymeric and Prince Nicolas 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: Princess Laetitia Maria, Princess Maria Laura, Princess Astrid, King Albert, Prince Laurent, Princess Claire, Prince Aymeric and Prince Nicolas 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)