Legally Blonde star Sheridan Smith and Jerry Mitchell, choreographer of Hairspray and Legally Blonde, took to the stage for a special performance of Hairspray number You Can’t Stop The Beat.
An audience of hundreds of school children joined in with the routine from their seats.
Strictly Come Dancing’s Camilla Dallerup also made an appearance, as did the Mayor of London, Boris Johnson, who treated us to a Bollywood dance demonstration.
“London is the greatest dance, musical and cultural city on Earth,” said the Mayor. “Get down on it and strut your funky stuff in Big Dance 2010.”