Lip Sync Battle: Anna Kendrick vs. John Krasinski

Spike'sLip Sync Battleis quickly becoming a Thursday night favorite. You can judge celebrities by how they interact with fans, what they do with their millions, and how they spend their time off-camera, but if they can't turn a performance, then what's the point?

This week pitted Anna Kendrick, whom we already know can actually sing, against the show's executive producer, John Krasinski. The first round brought out the boy band lover in each contestant: Krasinski nailed N*Sync's "Bye Bye Bye," hitting each step of the choreography -- the only thing missing were frosted tips.

Meanwhile, Kendrick went for a more contemporary choice where she clearly dedicated her performance of One Direction's "Steal My Girl" to Krasinski's wife (and previous contestant on the show), Emily Blunt.

Watch the video below:

Though Krasinski went into the second round seemingly ahead, his performance of Tina Turner's "Proud Mary" was missing a little something. No, it wasn't the metallic, fringed dress -- that was there. He just forgot that when you wear a skirt like that, you can't forego the heels.

As for Kendrick, she gave us flawless choreography during her lip sync of Jennifer Lopez's "Booty," which culminated in a cameo by Jennifer Lopez herself. And she also channelled some Beyonce hairography.

We're sure it's in the rule book somewhere that no matter what song you're singing, if Jennifer Lopez joins you on stage, you win. So, congratulations Anna Kendrick.