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Two Amazing Celebrities Crashed Gwen Stefani's "Carpool Karaoke" with James Corden

Best road trip ever.

Gwen Stefani was James Corden's latest passenger on The Late Late Show's "Carpool Karaoke," which is amazing in itself. Corden and Stefani jamming out to classic jams like "The Sweet Escape" and "Don't Speak" is what (nostalgic) dreams are made of. Oh, and Stefani looked flawless. She seriously doesn't age.

But this already-bomb "Carpool Karaoke" got even better when Stefani and Corden welcomed two additional A-list guests to their car. (Apparently, Los Angeles requires there be four passengers in a car in order to use the more-efficient carpool lane. Damn you, traffic laws!)

The first guest? You know, just George Clooney, who apparently was in the neighborhood trolling. They rounded out their quartet with Clooney's Money Monster co-star Julia Roberts. Such a casual road trip.

The foursome forged ahead, rocking out to Stefani's magnum opus "Hollaback Girl" and Queen's "We are the Champions," among other tunes. What we would've paid to sit in between Clooney and Roberts is scandalous. Seriously, Mr. Corden, we're available the next time you're in a carpool bind. Just call.