George Clooney, Julia Roberts join Gwen Stefani for karaoke

Gwen Stefani got a little help from George Clooney and Julia Roberts in "Late Late Show" host James Corden's latest "Carpool Karaoke" segment.

In the segment that aired early Thursday, Stefani and Corden take on a few of the former No Doubt singer's classics before pulling over their SUV under the guise of needing a few more passengers to travel in a carpool lane. Corden calls up Clooney, who shows up and dials Roberts.

The foursome is then shown riding around belting out Stefani's "Hollaback Girl" and Queen's "We Are The Champions."

Clooney and Roberts are co-starring in "Money Monster," which opens later this month.

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