Watch what happens when George Clooney and Julia Roberts surprise Gwen Stefani on ‘Carpool Karaoke’

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You never know who is going to show up on ‘Carpool Karaoke’! Gwen Stefani was the latest celebrity to join ‘Late Late Show’ host James Corden for the segment on Wednesday.

As Stefani and Corden sang some of her most famous songs, they came to a section of the highway that required four passengers. So, Corden called up none other than superstar George Clooney.

Clooney, who no doubt has many famous friends, called Julia Roberts, who quickly joined them to top off the superstar surprise!

**Watch the video above as all four rock out to Gwen Stefani’s songs**