LONDON - MAY 04: British Prime Minister David Cameron (R) and his wife Samantha Cameron are seen during the Diamond Jubilee, Buckingham Palace Concert May 04, 2012 in London, England. For only the ... more 

LONDON - MAY 04: British Prime Minister David Cameron (R) and his wife Samantha Cameron are seen during the Diamond Jubilee, Buckingham Palace Concert May 04, 2012 in London, England. For only the second ime in it's history, the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. (Photo by Dave Thompson - WPA Pool/Getty Images) less