Gwen Stefani and James Corden pick up surprise guests for Carpool Karaoke

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This may be one of the best Carpool Karaoke sessions ever. No Doubt.

Gwen Stefani, coach on “The Voice,” joined the Late Late Show to help host and sing along side James Corden. The duo sang all of her top songs, including “Don’t Speak” and “The Sweet Escape.”

Then, the already awesome video took a turn when George Clooney and Julia Roberts hopped in on the fun (as if Gwen Stefani wasn’t enough celebrity for one car to handle already).

The three guest celebrities and Corden hilariously sang along to songs like “Hollaback Girl,” where the group asked Stefani what her inspiration behind the song was. Well, the singer didn’t give details, but left them with this juicy comment.

“The real inspiration behind that song I would never say,” Stefani said. “All I’ll say is I won.”

To which Clooney replied,

“This sh*t is bananas! B-A-N-A-N-A-S.”

Watching Clooney and Roberts try their best to sing along and keep up with Stefani is pretty hilarious. Why did it have to end?

Watch the awesome video in the player above