Princess Beatrice of York arrives at Westminster Abbey in an eye-catching pink headpiece. (AFP )
Victoria Beckham arrives at the church in a modern take on the traditional pillbox hat. Designed by Philip Treacy, the embellished headpiece helped Beckham achieve her signature unique look. (AP )
Queen Sofia of Spain and Princess Letizia of Spain arrive at the wedding in traditional elegant headwear. (AFP)
Princess Eugenie of York, left, sports an aqua-blue feathered headpiece (Reuters )
Zara Phillips, granddaughter of Queen Elizabeth II, wears a big-brimmed hat with a black bow (AFP)
Denmark's Queen Margrethe arrives at Westminster in a bright blue matching hat and dress (AFP )
Camilla, Duchess of Cornwall, attends the ceremony in a big-brimmed cream hat designed by Phillip Treacy (AFP )
Queen Elizabeth II is seen wearing a pale yellow traditional top hat (AP )
Miriam Gonzalez Duantez, wife of Deputy Prime Minister Nick Clegg, arrives in a bright red flowered headpiece, giving a pop of color to her elegant black and white dress.
Guests wait for Kate Middleton to arrive at Westminster Abbey