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FILE PHOTO: Britain's Prince William and his wife Catherine, Duchess of Cambridge drive from Buckingham Palace in an Aston Martin DB6 Mark 2, after their wedding in Westminster Abbey, in central London, April 2011

FILE PHOTO: Britain's Prince William and his wife Catherine, Duchess of Cambridge drive from Buckingham Palace in an Aston Martin DB6 Mark 2, after their wedding in Westminster Abbey, in central London April 29, 2011. REUTERS/John Stillwell/Pool/File Photo

Royals William and Kate in Singapore

Britain's Prince William and his wife Catherine arrive in Singapore Tuesday, kicking off a nine-day Southeast Asian and Pacific tour marking Queen

Elizabeth II's Diamond Jubilee.