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Watch: George Clooney, Julia Roberts, and Gwen Stefani sing "Hollaback Girl" for Carpool Karaoke

Gwen Stefani stopped by The Late Late Show Wednesday night for a little Carpool Karaoke — and she wasn’t alone. Also joining Stefani and host James Corden were George Clooney and Julia Roberts.

Stefani and Corden started the segment by duetting their way through "Don’t Speak." Then they moved on to "The Sweet Escape," though Corden raised some objections halfway through the first verse, in the part where Stefani goes nuts and starts spitting out words so fast they just sound like a blur.

"I’m okay with lyrics," he said, "but I do not know what you’re saying there."

Once she’d talked him through the lines a few times ("I’ve been acting like sour milk all on the floor," who knew?), he was ready to perform the verse at Stefani speeds.

Of course, the highlight of the whole thing comes once George Clooney and Julia Roberts get in the car to sing "Hollaback Girl," starting at the eight-minute mark.

Look at those two Oscar winners grooving in the back seat. That shit is bananas. Right, George?

B-A-N-A-N-A-S.