TV LL Cool J Gears Up for 'Lip Sync Battle's' Epic Star-Studded Premiere By Raphael Chestang 5:18 PM PDT, April 1, 2015 Now Playing hh:mm:ss 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.NEWS: Watch Dwayne 'The Rock' Johnson's Amazing Lip Sync to Taylor Swift's 'Shake It Off'"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.NEWS: Top 5 Favorite Jimmy Fallon Lip Sync Battles"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."NEWS: Watch Will Ferrell Flawlessly Lip Syncs Beyonce's 'Drunk In Love'Watch the video for a clip of various contestants lip-syncing to one of LL's hits, 1990's "Mama Said Knock You Out."