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Joan Rivers

Angela Weiss for WireImage

Uh-oh! Joan Rivers and Missy Piggy are so not getting along.

Just last night, the Fashion Police queen was seen at QVC's pre-Oscar event at the Four Seasons with cake all over her face—and Miss Piggy had a lot everything to do with it!

In a video released this morning, Rivers and the Muppets maven 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!"

Miss Piggy, Joan Rivers, Muppets Take Manhattan

Tri-Star Pictures

When Miss Piggy tries to walk away, they get into a scuffle that ends with Rivers being pushed into a multi-tiered cake.

Oh, dear.

Miss Piggy is set to announce her new lifestyle brand, Moi by Miss Piggy, during a visit to QVC on March 16, just five days before Disney's Muppets Most Wanted hits theaters on March 21.

And to think Rivers made an appearance in a scene opposite Miss Piggy in the 1984 flick, The Muppets Take Manhattan.

And guess who will be stopping by E! News on Monday? Miss Piggy! Check it out at 7 and 11:30 p.m.