
Catherine and William, Duke and Duchess of Cambridge arrive at the BMO Centre to watch the Calgary Stampede in Calgary Canada, on 07 July 2011. The newlywed royal couple are on a twelve day visit to Canada and the United States. EPA/John Stillwell / PA Wire UK AND REPUBLIC OF IRELAND OUT - NO COMMERCIAL SALES

Catherine and William, Duke and Duchess of Cambridge arrive at BMO Centre to watch the Calgary Stampede in Calgary Canada, on 07 July 2011. The newlywed royal couple are on a twelve day visit to Canada and the United States. EPA/LIONEL HAHN / PA Wire UK AND REPUBLIC OF IRELAND OUT - NO COMMERCIAL SALES

Catherine and William, Duke and Duchess of Cambridge arrive at BMO Centre to watch the Calgary Stampede in Calgary Canada, on 07 July 2011. The newlywed royal couple are on a twelve day visit to Canada and the United States. EPA/LIONEL HAHN / PA Wire UK AND REPUBLIC OF IRELAND OUT - NO COMMERCIAL SALES

William and Catherine, Duke and Duchess of Cambridge, are presented with Smithbilt cowboy hats after arriving at Calgary Airport, Canada, on 07 July 2011. The newlywed royal couple are on a twelve day visit to Canada and the United States. EPA/IAN VOGLER / PA Wire UK AND REPUBLIC OF IRELAND OUT - NO COMMERCIAL SALES

Catherine and William, Duke and Duchess of Cambridge, greet six-year-old Diamond Marshall after arriving at Calgary Airport, Canada, on 07 July 2011. The newlywed royal couple are on a twelve day visit to Canada and the United States. EPA/LIONEL HAHN / PA Wire UK AND REPUBLIC OF IRELAND OUT - NO COMMERCIAL SALES

Catherine, Duchess of Cambridge greets six-year-old Diamond Marshall after arriving at Calgary Airport, Canada, on 07 July 2011. The newlywed royal couple are on a twelve day visit to Canada and the United States. EPA/IAN VOGLER / PA Wire UK AND REPUBLIC OF IRELAND OUT - NO COMMERCIAL SALES