Royal wedding guests: styles of hats

(L-R) Spain's Queen Sofia, Crown Prince Felipe and Princess Letizia arrive at Westminster Abbey before the wedding of Britain?s Prince William and Kate Middleton, in central London April 29, 2011. [Photo/Agencies]

Britain's Princess Anne (R) arrives at Buckingham Palace after the wedding ceremony of Britain's Prince William and Catherine, Duchess of Cambridge, in central London April 29, 2011. Prince William married his fiancee, Kate Middleton, in Westminster Abbey on Friday. [Photo/Agencies]