1. Gwen Stefani
This may very well be the the carpool karaoke with the biggest star power. Leave it to Gwen Stefani to bring the A-listers along for the ride. After singing Gwen’s “Don’t Speak,” “The Sweet Escape” and “Used to Love You,” James and Gwen made a pit top to pick up some friends, Julia Roberts and George Clooney. Even A-listers need a ride.
The foursome got underway and belted out Gwen’s “Hollaback Girl.” But the pièce de résistance was when all four broke into Queen’s “We Are the Champions.” Now that’s a carpool.