Prince William and Kate in Singapore

Prince William and his wife, Kate, Duchess of Cambridge, center, are greeted as they arrive at the VIP terminal of Changi International Airport on Sept. 11, 2012, in Singapore. The British royal couple is on an official three-day trip to Singapore.

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Kate, Duchess of Cambridge, reacts as she receives flowers upon arrival at the VIP terminal of Changi International Airport on Sept. 11, 2012, in Singapore. The Duke and Duchess of Cambridge are on a Diamond Jubilee tour of Southeast Asia and the South Pacific, taking in Singapore, Malaysia, the Solomon Islands and the tiny Pacific Island of Tuvalu.

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Prince William and his wife, Kate, Duchess of Cambridge, arrive at the Orchid Garden within the Singapore Botanical Gardens in Singapore on Sept. 11, 2012.

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Prince William, right, and Kate, Duchess of Cambridge, tour the Orchid Garden within the Singapore Botanical Gardens in Singapore on Sept. 11, 2012.

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Prince William and his wife Kate, Duchess of Cambridge, view an orchid hybrid named after William's mother, the late Diana, Princess of Wales, during a tour the Orchid Garden within the Singapore Botanical Gardens on Sept. 11, 2012, in in Singapore.

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Prince William and Kate, Duchess of Cambridge, tour the Orchid Garden within the Singapore Botanical Gardens in Singapore, on Sept. 11, 2012.

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Prince William and Kate, Duke and Duchess of Cambridge, view a hybrid orchid named in their honor at the Orchid Garden within the Singapore Botanical Gardens in Singapore on Sept. 11, 2012.

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Prince William and Kate, Duchess of Cambridge, visit the Singapore Botanical Gardens on Sept. 11, 2012, in Singapore.

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Prince William and Kate, Duchess of Cambridge, sign the guest book as they visit the Singapore Botanical Gardens on Sept. 11, 2012, in Singapore.

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Prince William and his wife, Kate, Duchess of Cambridge, leave the Singapore Botanical Gardens after their visit on Sept. 11, 2012, in Singapore.

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Prince William, the Duke of Cambridge, center, is accompanied by Singapore's President Tony Tan as he inspects an honor guard during the welcome ceremony at the Istana, or Presidential Palace, on Sept. 11, 2012, in Singapore.

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Prince William, the Duke of Cambridge, left, stops to talk to an honor guard member during the welcome ceremony at the Istana, or Presidential Palace, on Sept. 11, 2012, in Singapore.

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Kate, Duchess of Cambridge, right, attends the welcome ceremony for her husband, Prince William, at the Istana, or Presidential Palace, on Sept. 11, 2012, in Singapore.

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Kate, Duchess of Cambridge, and Prince William pose with Singapore's President Tony Tan and his wife, Mary Tan, at the Istana, or Presidential Palace, on Sept. 11, 2012, in Singapore.

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Kate, Duchess of Cambridge, walks with the president of Singapore's wife, Mary Tan, at the Istana on Sept. 11, 2012, in Singapore.

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Prince William chats with Singapore's President Tony Tan at the Istana on Sept. 11, 2012, in Singapore.

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Kate, Duchess of Cambridge, visits the Istana, or Presidential Palace, on Sept. 11, 2012, in Singapore.

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Prince William gives a speech at the Istana on Sept. 11, 2012, in Singapore.

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Kate, Duchess of Cambridge, sits down for a dinner as she visits the Istana with Prince William on Sept. 11, 2012, in Singapore.

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Kate, Duchess of Cambridge, toasts the president of Singapore's wife, Mary Tan, at a dinner as she visits the Istana with Prince William on Sept. 11, 2012, in Singapore.

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Kate, Duchess of Cambridge, meets children as she visits Gardens by the Bay with Prince William on Sept. 12, 2012, on the second day of the royal couple's trip to Singapore. The visit is part of a Diamond Jubilee tour of Southeast Asia, taking in Singapore, Malaysia, the Solomon Islands and Tuvalu.

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Prince William meets children as he visits Gardens by the Bay on Sept. 12, 2012, in Singapore.

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Prince William and his wife, Kate, the Duke and Duchess of Cambridge, visit Gardens by the Bay on Sept. 12, 2012, in Singapore.

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Prince William and Kate, Duchess of Cambridge, visit Gardens by the Bay on Sept. 12, 2012, in Singapore.

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Prince William and Kate, Duchess of Cambridge, tour the Rolls-Royce Seletar Campus during their Diamond Jubilee tour on Sept. 12, 2012, at Seletar Aerospace Park in Singapore.

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Prince William and his wife Kate, Duchess of Cambridge, tour the Rolls-Royce plant during their visit to Singapore on Sept. 12, 2012.

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Kate, Duchess of Cambridge, reacts after officiating a launch event at the Rolls-Royce plant in Singapore on Sept. 12, 2012. She pushed the final fan blade into the first Trent 1000 Aero to be produced at the plant.

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Kate, Duchess of Cambridge, laughs as she tours the Rolls-Royce Seletar Campus during the Diamond Jubilee tour at Seletar Aerospace Park on Sept. 12, 2012, in Singapore.

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Prince William addresses the crowd during a tour of the Rolls-Royce Seletar Campus on Sept. 12, 2012, in Singapore.

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Prince William, third right, signs a plaque while his wife, Kate, Duchess of Cambridge, second left, looks on during the launch of the first aero engine and fan blades produced at the Rolls-Royce plant in Singapore on Sept. 12, 2012.

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Kate, Duchess of Cambridge, meets members of public as she attends a cultural event in Queenstown on Sept. 12, 2012, in Singapore.

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Prince William, center, and his wife, Kate, Duchess of Cambridge, wave to the crowd during their visit to Strathmore Green, a precinct in Queenstown, a residential district of Singapore, on Sept. 12, 2012.

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Kate, Duchess of Cambridge, and Prince William watch a dancing dragon as they attend a cultural event in Queenstown on Sept. 12, 2012, in Singapore.

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Kate, Duchess of Cambridge, and Prince William watch demonstrations as they attend a cultural event in Queenstown on Sept. 12, 2012, in Singapore.

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Kate, Duchess of Cambridge, speaks with a child during a visit to The Rainbow Centre, a children's learning center, on Sept. 12, 2012, in Singapore.

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Kate, Duchess of Cambridge, and Prince William pose with a young artist as they visit The Rainbow Centre on Sept. 12, 2012, in Singapore.

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Kate, Duchess of Cambridge, and Prince William applaud as they visit The Rainbow Centre on Sept. 12, 2012, in Singapore.

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Kate, Duchess of Cambridge, and her husband, Prince William, visit the British High Commissioner's residence, Eden Hall, for dinner on Sept. 12, 2012, in Singapore.

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Kate, Duchess of Cambridge, signs the visitors' book as she and her husband, Prince William, visit the British High Commissioner's residence, Eden Hall, on Sept. 12, 2012 in Singapore.

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Kate, Duchess of Cambridge, and her husband, Prince William, visit the British High Commissioner's residence, Eden Hall, for dinner on Sept. 12, 2012, in Singapore.

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Prince William visits the British High Commissioner's residence, Eden Hall, for dinner on Sept. 12, 2012, in Singapore.

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Kate, Duchess of Cambridge, and her husband, Prince William, visit the British High Commissioner's residence, Eden Hall, for dinner on Sept. 12, 2012, in Singapore.

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Kate, Duchess of Cambridge, and Prince William visit Kranji Commonwealth War Cemetery on the third day of their Diamond Jubilee tour of the Far East on Sept. 13, 2012, in Singapore.

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Kate, Duchess of Cambridge, visits Kranji Commonwealth War Cemetery on on Sept. 13, 2012, in Singapore.

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Kate, Duchess of Cambridge, and Prince William visit Kranji Commonwealth War Cemetery on Sept. 13, 2012, in Singapore.

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