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CALGARY, AB - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive on a horse drawn carriage at a Government Reception at the BMO Centre on July 7, 2011 in Calgary, Canada. The newly married Royal Couple are on the eighth day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Chris Jackson/Getty Images)

CALGARY, AB - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge arrive on a horse drawn carriage at a Government Reception at the BMO Centre on July 7, 2011 in Calgary, Canada. The newly married Royal Couple are on the eighth day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Chris Jackson/Getty Images)
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CALGARY, AB - JULY 08: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave after the lauch of the Calgary Stampede on July 8, 2011 in Calgary, Canada. The newly married Royal Couple are on the eighth day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Phil Noble - Pool/Getty Images)

CALGARY, AB - JULY 08: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge leave after the lauch of the Calgary Stampede on July 8, 2011 in Calgary, Canada. The newly married Royal Couple are on the eighth day of their first joint overseas tour. The 12 day visit to North America is taking in some of the more remote areas of the country such as Prince Edward Island, Yellowknife and Calgary. The Royal couple started off their tour by joining millions of Canadians in taking part in Canada Day celebrations which mark Canada's 144th Birthday. (Photo by Phil Noble - Pool/Getty Images)
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CALGARY, AB - JULY 07: Prince William, Duke of Cambridge throws a barrel at Government Reception at the BMO Centre on day 8 of the Royal couple's tour of North America on July 7, 2011 in Calgary, Canada.

CALGARY, AB - JULY 07: Prince William, Duke of Cambridge throws a barrel at Government Reception at the BMO Centre on day 8 of the Royal couple's tour of North America on July 7, 2011 in Calgary, Canada.
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CALGARY, AB - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend a Government Reception at the BMO Centre on day 8 of the Royal couple's tour of North America on July 7, 2011 in Calgary, Canada.

CALGARY, AB - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge attend a Government Reception at the BMO Centre on day 8 of the Royal couple's tour of North America on July 7, 2011 in Calgary, Canada.
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WireImage Samir Hussein

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CALGARY, AB - JULY 07: Canadian Prime Minister Stephen Harper toasts Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge at a Government Reception at the BMO Centre on day 8 of the Royal couple's tour of North America on July 7, 2011 in Calgary, Canada.

CALGARY, AB - JULY 07: Canadian Prime Minister Stephen Harper toasts Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge at a Government Reception at the BMO Centre on day 8 of the Royal couple's tour of North America on July 7, 2011 in Calgary, Canada.
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WireImage Samir Hussein