Joan Rivers, Kelly Osbourne, George Katsiopoulos, Giuliana Rancic, Fashion Police, Halloween

Brandon Hickman/E! Networks

Ain't no Fashion Police party like a Halloween party. It's the perfect opportunity to dress up like a star and diss them all at the very same time.

Take hosts Kelly Osbourne and George Kotsiopoulos, who dressed up as Jennifer Lopez and Marc Anthony for this show. 

"You know what your problem is?" Joan Rivers quizzed George, er, Marc. "You were married to Miss Universe, then Jennifer Lopez. You're aiming too high. Try dating Kathy Bates. She'd stay with you forever. I hear she screams like a demon."

Click in below to get all of Joan's jokes that didn't make it on air in our sassy sartorial photo gallery—after you've watched tonight's show for more stylishly spooky fun!

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