Britain's Catherine, Duchess of Cambridge attends 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 began the first full day of engagements in the first state visit by a Singaporean president to Britain. AFP PHOTO / POOL / TOBY MELVILLE        (Photo credit should read TOBY MELVILLE/AFP/Getty Images)