Crown Prince Alexander II (L) of Serbia and Crown Princess Katherine arrive at Windsor Castle, west of London, on May 18, 2012, for a Sovereign's Jubilee Lunch hosted by Britain's Queen Elizabeth II. A glittering lunch for the world's sovereigns to be held on Friday to celebrate the diamond jubilee of Britain's Queen Elizabeth II has been marked by a withdrawal and protests over the guest list. AFP PHOTO / Dominic Lipinski/POOL (Photo credit should read Dominic Lipinski/AFP/GettyImages)
