Britain's Prince Philip (C) talks to Prince Charles (L), Prince William (2nd R) and Prince Harry on the Spirit of Chartwell during the Diamond Jubilee River Pageant on the River Thames, in London June 3, 2012. Queen Elizabeth joined an armada of 1,000 boats in a gilded royal barge, in a pageant down the River Thames on Sunday in a spectacular highlight of four days of nationwide celebrations to mark her Diamond Jubilee. REUTERS/John Stillwell/Pool (BRITAIN - Tags: ROYALS ENTERTAINMENT SOCIETY ANNIVERSARY)