Carpool Karaoke
Credit: Darren Michaels/CBS

James Corden's Carpool Karaoke is a hit again.

The newest episode featured Gwen Stefani who jammed out with Corden to some of her hits including Don't Speak, Sweet Escape and her newest single Used to Love You.

The two spoke of Gwen's love for emojis and they also analyzed the meaning behind the eggplant emoji.

Stefani reveals that her secret to not aging is happiness referring to her relationship with Blake Shelton. “My life blew up. I kind of started falling in love and then I wrote a whole record about that… that's what a facelift is,” said the singer.

In the segment, Corden realized he needed four people in his car to continue to use the HOV lane. That's when he calls George Clooney to join them, who then rings up Julia Roberts to be a part of the fun.

All four immediately continued the jam session and sang Hollaback Girl where Clooney didn't shy away from singing and dancing. Clooney spelled out B-A-N-A-N-A-S while moving his head to the beat. Priceless.

Clooney took a guess on the meaning of the term “Hollaback Girl” but Stefani said she'd never reveal the truth about what actually inspired the song.

Clooney and Roberts also shared their favorite lines from their films.

Watch the video below: