The 37-year-old Little Britain comic originally joined the five-strong male dance troupe on stage for their rendition of disco classic 'It's Raining Men' on the ITV1 talent show back in April.
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On Saturday night (June 30), Walliams slipped back into the sequinned sailor suit for his performance at the London nightclub in front of hundreds of fans, including supermodel wife Lara Stone.
He tweeted ahead of the show: "We're back, back, back... !"
He added later: "So I re-united with the Showbears for one night only at G.A.Y in London. Just like on the TV I knew only some of the words and dance moves."