Later [at the reception] he and Kate raised the roof with a hilarious version of You’re The One That I Want from Grease.
With William dressed in a black tuxedo and bow tie and Kate wearing her stunning strapless white evening dress, they strutted and sang their way through the John Travolta and Olivia Newton-John classic.
Guests were on their feet whooping, clapping and cheering as the beaming newlyweds let their hair down – and showed off fun-loving personalities.
One bleary-eyed guest – who left the party at 3.15am – said: “The Grease number brought the house down.
“They stood holding hands in the middle of the dancefloor grinning, then suddenly the opening bars of the song came booming out.
“The reaction was just brilliant. Everyone started clapping to the music.
“Wills and Kate began dancing around, pointing at each other and mouthing the words. It was hilarious.
“When the song finished, they ended up in each other’s arms with massive smiles on their faces.
“Everyone was cheering wildly, whooping and they did a bow to each other.
“After that, the dancefloor filled up and the party got going properly. It was a fabulous night. The kind of night you never forget.”