Miss Piggy Attacks Joan Rivers!

Miss Piggy lost her temper and threw flour all over Joan Rivers, at a pre-Oscar party, for QVC.

In a video clip, available online, Rivers and the Muppets diva are seen fighting backstage at the party.

"What are you selling, half-baked hams?" Rivers sneers, referring to Miss Piggy's upcoming appearance on QVC.

Miss Piggy fires back, "Oh, a pork joke, how original, Joan! Here let me try—Plastic surgery, plastic surgery, plastic surgery! Old!"