LL Cool J Gears Up for 'Lip Sync Battle's' Epic Star-Studded Premiere

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LL Cool J hosts Spike TV's series Lip Sync Battle, premiering April 2, and the NCIS: Los Angeles star stopped by ET to dish on what viewers can expect.

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"It's really simple," LL said, explaining the concept of the show. "It's two celebrities and the audience decides who lip syncs the best."

Inspired by Jimmy Fallon's late-night sketches, contestants have included Justin Bieber, Jennifer Lopez, Mike Tyson, Chrissy Teigen, John Legend, Common, Anna Kendrick and Dwayne "The Rock" Johnson.

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"It's so much fun. So many A-list, great acts came out and just had a ball," LL gushed.

While most celebrities were game for the show's shenanigans, LL said a few were hesitant about doing the show.

"Nobody wants to go on there and look ridiculous," LL said. "But it was a lot of fun."

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Watch the video for a clip of various contestants lip-syncing to one of LL's hits, 1990's "Mama Said Knock You Out."