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CALGARY, AB, CANADA - JULY 07: Catherine, Duchess of Cambridge greets Diamond Marshall, 6, after arriving with Prince William, Duke of Cambridge at Calgary International Airport on July 7, 2011 in Calgary, Alberta, Canada. The newlywed royal couple are on their eighth day of their first joint overseas tour visiting Canada and the United States. 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. (Photo by Ian Vogler - WPA Pool/Getty Images)

CALGARY, AB, CANADA - JULY 07: Catherine, Duchess of Cambridge greets Diamond Marshall, 6, after arriving with Prince William, Duke of Cambridge at Calgary International Airport on July 7, 2011 in Calgary, Alberta, Canada. The newlywed royal couple are on their eighth day of their first joint overseas tour visiting Canada and the United States. 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. (Photo by Ian Vogler - WPA Pool/Getty Images)
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CALGARY, AB, CANADA - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge wear their new Smithbilt cowboy hats riding a carriage as they arrive for a rodeo demonstration at a Government Reception at the BMO Centre on July 7, 2011 in Calgary, Alberta, Canada. The newlywed royal couple are on their eighth day of their first joint overseas tour visiting Canada and the United States. 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. (Photo by David Rose - WPA Pool/Getty Images)

CALGARY, AB, CANADA - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge wear their new Smithbilt cowboy hats riding a carriage as they arrive for a rodeo demonstration at a Government Reception at the BMO Centre on July 7, 2011 in Calgary, Alberta, Canada. The newlywed royal couple are on their eighth day of their first joint overseas tour visiting Canada and the United States. 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. (Photo by David Rose - WPA Pool/Getty Images)
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CALGARY, AB, CANADA - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge wear their new Smithbilt cowboy hats as they watch a rodeo demonstration at a Government Reception at the BMO Centre on July 7, 2011 in Calgary, Alberta, Canada. The newlywed royal couple are on their eighth day of their first joint overseas tour visiting Canada and the United States. 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. (Photo by David Rose - WPA Pool/Getty Images)

CALGARY, AB, CANADA - JULY 07: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge wear their new Smithbilt cowboy hats as they watch a rodeo demonstration at a Government Reception at the BMO Centre on July 7, 2011 in Calgary, Alberta, Canada. The newlywed royal couple are on their eighth day of their first joint overseas tour visiting Canada and the United States. 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. (Photo by David Rose - WPA Pool/Getty Images)
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