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17 May 2012, 11:44
The Duke and Duchess of Cambridge will join the Queen on her royal barge during the Diamond Jubilee River Pageant.
William and Kate will be at her Majesty's side as the barge travels along the Thames with a thousand other boats on 3rd June.
Prince Harry will also be on the barge, along with his dad Prince Charles, The Duchess of Cambridge, and the Duke of Edinburgh.
Up to a million people are expected to watch the flotilla from the banks of the Thames.