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LONDON - MAY 5: Queen Elizabeth II cuts a cake as Prince Philip, Duke of Edinburgh looks on during a visit to The Royal Botanic Gardens in Kew on May 5, 2009 in London, England. The Royal Botanic Gardens at Kew was celebrating it's 250th Anniversary. (Photo by Johnny Green - WPA Pool/Getty Images)

LONDON - MAY 5: Queen Elizabeth II cuts a cake as Prince Philip, Duke of Edinburgh looks on during a visit to The Royal Botanic Gardens in Kew on May 5, 2009 in London, England.  The Royal Botanic Gardens at Kew was celebrating it's 250th Anniversary.  (Photo by Johnny Green - WPA Pool/Getty Images)