George Clooney And Julia Roberts Take Carpool Karaoke To A New Level With Gwen Stefani

James Corden's got the plug.

James Corden's Carpool Karaoke with Gwen Stefani started out normal enough.

The duo began with her 1995 hit with No Doubt, "Don't Speak."

Then Gwen had to explain to James the lyrics to "The Sweet Escape."

Altogether now, deep breath, "Cause I've been acting like sour milk all on the floor, it's your fault you didn't shut the refrigerator, maybe that's the reason I've been acting so cold."

After a few more songs, Gwen and James need four people to travel in the HOV lane. It's time to make some calls.

That's when this carpool took a turn for the crazy. Turns out, that "sweetheart" was none other than George Clooney, who in turn made a phone call himself.

And, of course, who else would he call besides his BFF Julia Roberts?

We'll let them take it from here. Just wait until they get into "We Are the Champions." Can you say #CarpoolGoals?