This is why Spike's "Lip Sync Battle" is already must-see TV. It just premiered in early April and it's now a Thursday night staple, thanks to performances like this one from "Pitch Perfect" star Anna Kendrick.

Last night (April 16), Anna took on John Krasinski, who is a producer of the show. She did two songs: "Steal My Girl" by One Direction, and "Booty" by Jennifer Lopez and Pitbull. For her fully choreographed "Booty" performance, she got back-up from the singer herself, J.Lo, and that sealed the deal. Total ownage.

Check out the "Booty" performance here, with Jenny from the Block's cameo:

Boom! John couldn't top that, although he was no slouch with "Bye Bye Bye" by NSYNC and "Proud Mary" by Tina Turner. Check out his clips over here.