The two starlets each picked the other's worst outfit from the year of 2000 and Joan Rivers loves every second of it. She exclaims, "Let the backstabbing begin!"
Tori tries to defend her look, "I think this was the year I made my hair dark, I was trying to be taken seriously."
Find out why Joan compares Tori to Arsenio Hall and why she says Jennie looks like a "prostitute on a safari!"
Watch the hilarious clip above!
Tune-in to an all-new Fashion Police this Friday at 9/8c on E!