Celebrities perform at the Diamond Jubilee concert

Singer Robbie Williams performs near the Band of the Welsh Guards during the Diamond Jubilee concert in front of Buckingham Palace in London June 4, 2012. Robbie Williams kicked off a concert outside Queen Elizabeth's sumptuous London residence on Monday before huge crowds gathered to celebrate the monarch's 60 years on the throne.[Photo/Agencies]

Singer Robbie Williams performs during the Diamond Jubilee concert in front of Buckingham Palace in London June 4, 2012.[Photo/Agencies]