EXCLUSIVE: Olivia Munn Preps for Epic 'Lip Sync Battle' Against Kevin Hart

This video is unavailable because we were unable to load a message from our sponsors.

If you are using ad-blocking software, please disable it and reload the page.

Olivia Munn geared up to sync her heart out in going head to head with her Ride Along 2 co-star Kevin Hart, but she appeared to have left her confidence at home.

"I'm doing my own individual performance and then Kevin Hart is winning Lip Sync Battle," the actress told ET with a laugh backstage.

WATCH: Beyonce Crashed Channing Tatum's Epic 'Lip Sync Battle'

Hart gave his all in performing Usher's "OMG" and even wore sweatpants so as not to impede his flexibility in recreating the pop star's dance moves.

"The thing with Usher is there's a lot of unnecessary pointing, and I came out here with drop-crotch sweatpants for a reason, people!" Hart says in a clip from the next episode.

Find out how Hart's Usher stands up to Munn's rendition of Nelly and Kelly Rowland's "Dilemma" when Lip Sync Battle airs Thursday at 10 p.m. ET/PT on Spike.