Prince William has helped the BBC's Sport Relief raise more than £11m through a mile run.
The surprise entrant joined 10,000 people along London's Embankment.
The appeal was organised by Comic Relief and BBC Sport to raise money for children in poverty in the UK and abroad and help disadvantaged people.
Across the UK 81,000 people took part in 144 official races to help achieve a record £11,078,359. The BBC transmitted five hours of programmes for the event.
Hosts included Gary Lineker, Gabby Logan, Jamie Theakston and Tess Daley.
There was an interview with England football captain David Beckham by The Fast Show's legendary Ron Manager, played by comedian Paul Whitehouse.
Other highlights included Superstars: Battle of the Channels, a boxing match between EastEnder Sid Owen and Castaway's Ben Fogle and a meeting of the sports quiz shows They Think It's All Over and A Question Of Sport.
Sport Relief's 'Go the extra Mile' campaign slogan was dreamed up in recognition of the 50th anniversary of Roger Bannister running the first sub-four minute mile.
Before Prince William started his run at London's Embankment he jokingly said he was in great condition.
"I've been training for about two minutes. I've had a good run round the block," he said.
Comedian Patrick Kielty and Prince William running for Sport Relief
The prince's appearance was kept secret until just before the race in London started.
"I've run a few miles in my time, not very well. I'm better at being stuck in the swimming pool. It's brilliant, it's an awesome sight what's going on all over the country," the prince said.
Prince William, 22, was expected to run with his brother Prince Harry, 19, but he had to pull out because of an injury.
Lord Coe, the former UK Olympic medal winner and Chair of London's 2012 Olympic Bid, put the runners under starters orders.
The prince, who was also joined by celebrity chef Gordon Ramsay and comics Patrick Kielty and Nick Hancock, took six minutes and ten seconds to finish the race.
At the end he said he thought his brother would have finished the race a lot quicker than him.
Martyn Smith, senior producer of the Sport Relief campaign at the London Mile, said: "It was fantastic to see Prince William leading off 10,000 people at the Embankment.
"The Sport Relief Mile was the perfect event for all those people, especially families, who have always wanted to enjoy the London Marathon experience but aren't able to run that far."