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Sergeant Emma Probert (right), a Metropolitan Police Royal Protection Officer assigned to protect Catherine Middleton (left), fiancee of Prince William, on duty at Witton Country Park, Blackburn, Lancashire. (Photo by John Stillwell/PA Images via Getty Images)

Sergeant Emma Probert (right), a Metropolitan Police Royal Protection Officer assigned to protect Catherine Middleton (left), fiancee of Prince William, on duty at Witton Country Park, Blackburn, Lancashire.   (Photo by John Stillwell/PA Images via Getty Images)