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Britain's Camilla, Duchess of Cornwall (2R) and Catherine, Duchess of Cambridge (L) await ahead of a plaque unveiling by Queen Elizabeth II, as London Mayor Boris Johnson (R) looks on outside after a visit to a department store in central London on March 1, 2012. The queen unveiled a plaque on the pavement to commemorate the refurbishment of Piccadily upon departure after touring the Fortnum and Mason store with their royal highnesses. AFP PHOTO / POOL / TOBY MELVILLE (Photo credit should read TOBY MELVILLE/AFP/GettyImages)

Britain's Camilla, Duchess of Cornwall (2R) and Catherine, Duchess of Cambridge (L) await ahead of a plaque unveiling by Queen Elizabeth II, as London Mayor Boris Johnson (R) looks on outside after a visit to a department store in central London on March 1, 2012. The queen unveiled a plaque on the pavement to commemorate the refurbishment of Piccadily upon departure after touring the Fortnum and Mason store with their royal highnesses.  AFP PHOTO / POOL / TOBY MELVILLE        (Photo credit should read TOBY MELVILLE/AFP/GettyImages)