Superproducer Mark Ronson was given a bum deal at a charity show in London - after British comic David Walliams wrestled him to the floor and removed his underpants.
The Grammy Award-winner joined the Little Britain star at the Concert For CARE show at the O2 Academy, Brixton on Monday night (02Nov09).
Walliams performed a stand-up set at the event and - in the guise of his comedy alter-ego Des Kay - invited his celebrity pal on to the stage.
But Ronson was horrified when the funnyman grabbed his crotch and then threw him to the floor, pulling at his trousers as the musician desperately fought to protect his modesty.
After successfully removing Ronson's underwear and baring his backside to the crowd, Walliams exclaimed, "It's just a bit of fun, Mark!" before allowing the visibly furious star to get to his feet.
The show, in aid of poverty-relief charity CARE International (CARE), also featured performances from Take That star Gary Barlow and British rockers Kaiser Chiefs.