Britain's Catherine, the Duchess of Cambridge, takes part in Canada Day celebrations in Ottawa July 1, 2011. Prince William and his wife Catherine, Duchess of Cambridge, are on a royal tour of Canada from June 30 to July 8.[Photo/Agencies]  

Britain's Prince William and his wife Catherine, the Duchess of Cambridge, arrive at a citizenship ceremony at the Canadian Museum of Civilization in Hull, Quebec near Ottawa July 1, 2011.[Photo/Agencies]