A host of celebrities helped the couple enjoy their last night of freedom with a cabaret performance at a plush nightclub in London’s West End on Monday night.
Elton and Mr Furnish were smuggled into the Too2Much venue in Soho just minutes before the show was to start.
TV presenter Paul O’Grady, who compered the event, earlier said: “We’re going to tie them to a lamppost, cover them with shaving foam - it’s an old-fashioned stag do.”
Among the stars who arrived at the club were Ozzy Osbourne, accompanied by wife Sharon and children Jack and Kelly, Janet Street-Porter, Cilla Black and musicians Bryan Adams, Gary Barlow and Kid Rock.
As she entered the venue, Cilla said: “They don’t want presents, they want donations for the various Aids charities. But I’m still going to buy them a present, I’m going to get them the tackiest toaster I can find.”
Other guests included TV presenter and model Donna Air, Scissor Sisters frontman Jake Shears and Tamara Mellon, president of upmarket shoe company Jimmy Choo.
Composer Tim Rice and fashion gurus Trinny Woodall and Susannah Constantine also attended the do.
Outside the venue, actress and model Liz Hurley was seen with her fiancé Arun Nayer in a silver car.
Inside, topless waiters wearing black ties and riding boots were seen serving guests with flutes of champagne, while deliveries of sushi and presents were taken through the main entrance.
The club was once Soho’s most famous strip club, named Raymond’s Revue Bar, reputed to be Britain’s first nude cabaret bar.
Inside, the plush decor includes an auditorium with red leather and banquette seating, a bar decorated with Swarovski crystals, chairs dipped in rubber and sculptured glass walls.
Elton will “marry” Mr Furnish at Windsor’s Guildhall, Berkshire, today in what will be one of England’s first civil partnerships.
The elegant 17th century building was the Prince of Wales’s choice of venue for his marriage to the Duchess of Cornwall in April.