Britain's Catherine, Duchess of Cambridge (L), takes her seat in a State Carriage with her husband Britain's Prince William, Duke of Cambridge (R), for the carriage procession to Buckingham Palace as part of the ceremonial welcome ceremony for Singapore's President Tony Tan Keng Yam at the start of a state visit at Horse Guards Parade in central London on October 21, 2014. Singapore's President Tony Tan Keng Yam began the first full day of engagements in the first state visit by a Singaporean president to Britain. AFP PHOTO / POOL / LEON NEAL        (Photo credit should read LEON NEAL/AFP/Getty Images)