It's a fashion face-off between two of the biggest divas in Hollywood, Mariah Carey and Beyoncé

These two stunning ladies both rocked a gorgeous Roberto Cavalli dress on stage, but Mariah made some very revealing alterations. 

"Beyoncé keeps it tight, she works it out, she can pull this off beautifully," George Kotsiopoulos argues. 

Watch the above clip to hear Joan Rivers' hilarious comments and see who the Fashion Police chose as the winner!

Tune-in to a brand new Fashion Police this Friday at 9/8c only on E!

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