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The Take That star will sing for the Duke and Duchess of Cambridge at a gala dinner for the Olympics.
Prince William and Catherine Middleton are guests of honour at the event, which will celebrate the country's Olympic and Paralympic athletes.
Along with Prince Harry, the royal pair are ambassadors for Team GB, and are playing an active role encouraging the public to support the nation's athletes.
Will Young, Alfie Boe and Britain's Got Talent winners Spellbound will also perform at the dinner next Friday.
London 2012 kicks off with football on Wednesday 25th July.