NEW YORK (CBSNewYork) -- When Gwen Stefani joined James Corden on "Carpool Karaoke" on Wednesday night, he said they needed two more passengers to use the HOV lane on the freeway.
But just who did they pick up?
None other than George Clooney and Julia Roberts! The duo climbed into the back seat and joined Stefani and Corden in a special rendition of "Hollaback Girl," along with some other hit songs.
Clooney and Roberts are starring in the upcoming film "Money Monster," set to hit theaters on May 13.
Want more? Catch the full segment by clicking on the video above.
Stefani is one of many guests to appear on Corden's hit segment. Big-name stars like Adele, Jason Derulo, Iggy Azeala, Justin Bieber and even R&B legend Stevie Wonder have all stopped by for a musical car ride.
You can catch "Carpool Karaoke" on "The Late Late Show With James Corden" weeknights on CBS.
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