Britney vs. Keira

 Image by Splash News

Let the catfight begin! Round I: Britney Spears vs. Keira Knightley.

Earlier this year the 'Pirates of the Caribbean' star branded Spears a "slut" after she was photographed pantiless on the town.

Recently Spears laughed off the comments, adding, "Who's Keira Knightley? I guess she must need the publicity."

I never thought I'd say this but Round I goes to Britney! Who gets your vote?