Gwen Stefani, George Clooney, Julia Roberts take over Carpool Karaoke

LOS ANGELES, May 5 (UPI) -- Gwen Stefani's appearance on James Corden's Carpool Karaoke segment included a visit from actors George Clooney and Julia Roberts.

The musical carpool aired Wednesday on The Late Late Show, where Stefani and Corden sang along to her hits "Don't Speak," "Sweet Escape," and "Used To Love You" before enlisting the Money Monster stars.

During the clip, Clooney refers to the late night host as a "pain in the [expletive]," while calling Roberts on the phone. Once in the car, the four immediately begin jamming to Stefani's "Hollaback Girl."

Toward the end, the group stretch their vocal talents with "We Are The Champions."