Greece's Crown Prince Pavlos and Crown Princess Marie-Chantal arrive at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton, in central London April 29, 2011. [Photo/Agencies]

Sweden's Crown Princess Victoria (R) and her husband Prince Daniel, the Duke of Vastergotland, arrive at Westminster Abbey before the wedding of Britain's Prince William and Kate Middleton in central London April 29, 2011. [Photo/Agencies]