Watch Gwen Stefani and James Corden's Carpool Karaoke With A Surprise Guest

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When it comes to Carpool Karaoke, The Late Late Show with James Corden pretty much has it down.

This time around Corden is joined by Gwen Stefani and a very special guest that you may or may not have seen coming.

It all kicks off with Corden driving around in traffic. He thanks Stefani for helping him get to work today.

Corden turns on the radio and on comes "Don't Speak" from Stefani's No Doubt days. Corden mentions that Stefani is ageless because she just keeps looking younger.

Stefani says her life blew up and she started falling in love. She thinks that is what the facelift is.

She is writing about happiness and love.

The duo then switches over to "The Sweet Escape." Stefani has to walk him through a tough part of the song and when he finally gets it the celebration and performance kicks off once again.

During the Carpool Karaoke Stefani found out what the eggplant Emoji means before singing her new hit, "Used To Love You." They threw it back a little with "Rich Girl" in a pretty awesome rendition.

Corden came up to the HOV Four and figured out that he had to pick up two more guests. He makes a phone call and George Clooney shows up instantly.

Clooney has to make a call to get the fourth person and in comes Julia Roberts. No one really saw that one coming at all.

Everyone gets buckled up and jams out to "Hollaback Girl." That's right, George Clooney and Julia Roberts were jamming out to Stefani's "Hollaback Girl." The priceless meter is at an all time high as the four kill their Carpool Karaoke performance.

You can check out the rest of the awesome Carpool Karaoke with Corden, Stefani, Clooney and Roberts in the video below.

Watch Gwen Stefani and James Corden's Carpool Karaoke with George Clooney and Julia Roberts