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Britain's Prince William (C) and his wife Catherine, Duchess of Cambridge, take part in a youth reception at Rideau Hall in Ottawa June 30, 2011.

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Britain's Prince William (unseen) and his wife Catherine, Duchess of Cambridge arrive at Ottawa's Macdonald-Catier International Airport in Canada June 30, 2011.

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The Duchess of Cambridge is saluted by a Mountie as she arrives in Ottawa on Thursday June 30, 2011.

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Britain's Prince William and his wife Catherine, Duchess of Cambridge arrive at Ottawa's Macdonald-Catier International Airport in Canada June 30, 2011.

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Prince William, Duke of Cambridge & Catherine, Duchess of Cambridge board a plane of the Royal Canadian Air Force at London's Heathrow Airport on June 30, 2011 in London, England.WPA Pool/Getty Images

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Prince William, Duke of Cambridge talks to James Wright (left), the Canadian High Commissioner to the United Kingdom while he and Catherine, Duchess of Cambridge (rear right) walk to board a plane of the Royal Canadian Air Force at London's Heathrow Airport on June 30, 2011 in London, England.

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Catherine, The Duchess of Cambridge, arrives to board a plane of the Royal Canadian Air Force at London's Heathrow Airport to travel to Ottawa, Canada, on June 30, 2011

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