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Anna Kendrick Schools James Corden in a "Pitch Perfect" Style Riff-Off

Who wins?

Last night the Late Late Show staged turned into a scene from Pitch Perfect. Anna Kendrick surprised everyone when she called out James Corden to do a live riff-off.

"I heard you've been telling people that you're the best acapella singer in town," Kendrick says, before challenging the host to a riff-off. "I think this audience wants to see me kick your ass."

With the backup from boyband The Filharmonic, Kendrick and Corden go through hit after hit including N'Sync "Bye Bye Bye," Pat Benatar's "Love is a Battlefield," Vanilla Ice's "Ice Ice Baby," and more. Who wins? Watch the video above, and tell us who should be crowned riff-off champion.