Squeaky-clean TOM CRUISE is set to shock fans in new movie TROPIC THUNDER with his foul-mouth.

The usually clean-cut star will use "colourful language" in his role as a studio boss in the comedy, which stars Ben Stiller and Robert Downey Jr.

But that's not all, the actor, whi has been a Hollywood sex symbol for two decades, will be unrecognisable as he appears fat and bald in the film

Stiller reveals, "We knew we were locked into a R-rating from the language in the beginning of the movie anyway, from all the war movie dialogue.

"You just have to do that if you're doing a war movie. I think a lot of these studio guys talk like that. I know from personal experience. I have heard people in movie studios curse."