Denmark's Queen Margrethe arrives at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton in central London April 29, 2011. [Photo/Agencies]

Carole and Michael Middleton, parents of Catherine, Duchess of Cambridge, travel with Britain's Prince Charles and Camilla, Duchess of Cornwall to Buckingham Palace in a Semi-State Landau, along the Procession Route, after the wedding of Prince William and Kate Middleton in Westminster Abbey, in central London April 29, 2011. [Photo/Agencies]