Gwen Stefani (And Surprise Guests) Join James Corden for Carpool Karaoke

Gwen Stefani became the latest singer to jump into the carpool lane with James Corden on Wednesday night.

But she didn't sit there alone.

At first, Stefani and Corden belted out No Doubt's "Don't Speak," followed by the artist's solo hits "Used to Love You," "The Great Escape," and "Rich Girl" as part of the latest version of Carpool Karaoke.

But then things turn a turn for the MEGA A-LIST.

No offense to Stefani.

George Clooney and Julia Roberts soon joined the fun, showing off a bit of their own vocal talent as the unexpected group sang "Hollaback Girl," and talked about their interpretations of the track before launching into a rousing version of Queen's "We Are The Champions."

It. Was. Awesome!

The three-time Grammy winner also managed to drop a few lines from recent chart-topper “Used to Love You," along with the unforgettable No Doubt track “Don’t Speak” prior to the arrival of Oscar royalty.

Watch for yourself:

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