LONDON, UNITED KINGDOM - JUNE 30: 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. The Duke and Duchess of Cambridge travel to Ottawa for their first overseas tour as a married couple, the 11 day tour will take them to Canada and then on to California. (Photo by Steve Parsons - WPA Pool/Getty Images)
Getty Images

Getty Images Entertainment WPA Pool

LONDON, UNITED KINGDOM - JUNE 30: Catherine, Duchess of Cambridge arrives to board a plane of the Royal Canadian Air Force at London's Heathrow Airport on June 30, 2011 in London, England. The Duke and Duchess of Cambridge travel to Ottawa for their first overseas tour as a married couple, the 11 day tour will take them to Canada and then on to California. (Photo by Steve Parsons - WPA Pool/Getty Images)
Getty Images

Getty Images Entertainment WPA Pool

LONDON, UNITED KINGDOM - JUNE 30: 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. The Duke and Duchess of Cambridge travel to Ottawa for their first overseas tour as a married couple, the 11 day tour will take them to Canada and then on to California. (Photo by Steve Parsons - WPA Pool/Getty Images)
Getty Images

Getty Images Entertainment WPA Pool

LONDON, UNITED KINGDOM - JUNE 30: 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. The Duke and Duchess of Cambridge travel to Ottawa for their first overseas tour as a married couple, the 11 day tour will take them to Canada and then on to California. (Photo by Steve Parsons - WPA Pool/Getty Images)
Getty Images

Getty Images Entertainment WPA Pool