James Corden talks 'terrifying' experience with Justin Timberlake

James Corden will replace Craig Ferguson as host of "The Late Late Show" on CBS next year, part of a complete overhaul of the network's late-night talk show lineup put in motion by the impending retirement of David Letterman, the network said Monday, Sept. 8, 2014. (AP)

James Corden has sung with the likes of Adele, Stevie Wonder, and Mariah Carey, but that doesn't mean "The Late Late Show" host wasn't afraid to get in the recording studio with pop superstar Justin Timberlake for their new animated film "Trolls."

MORE: Lady Gaga Teases 'Carpool Karaoke' Appearance: 'Had a Little Fun With James Corden Today!'

"I spent like half a day doing singing which is always quite, you know, terrifying if you're me, and it's him, but I think I got away with it," Corden told ET's Cameron Mathison at the Los Angeles premiere of the film on Sunday. "I think it was fun. I certainly loved it."

And though he's had plenty of A-list performances in his famous "Carpool Karaoke" segment, Corden was quick to point out, "Not in a studio, not like actually singing like it matters."

In fact, Corden went on to tease that his next guest will be none other than Lady Gaga herself.

"Something happens in that 'Carpool' that's never happened before," he told ET.

MORE: James Corden Reveals Kanye West Canceled on 'Carpool Karaoke' Twice, Apologized in the Most Kanye Way Ever

Gaga recently teased their upcoming performance on Twitter, writing, "Had a lil fun with @JKCorden today! Coming soon! #JOANNE #CARPOOLKARAOKE #MILLIONREASONS #PERFECTILLUSION."

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