James Corden continues to top himself on “The Late Late Show.”

For last night’s edition of fan-favorite “Carpool Karaoke,” the CBS late night host welcomed megastars Gwen Stefani, George Clooney and Julia Roberts!

The drive started out with just Corden and Stefani in the car. “You look really cute today,” the singer said at the beginning of the trip. “I feel like we’re in a band right now.” The talk show host replied, “No doubt,” a not-so-sly reference to the group that first made the blonde artist a household name.

After singing her band’s hit “Don’t Speak” together, Corden complimented the gorgeous Stefani by saying she’s like Benjamin Button. “You’re just not aging,” he told her. “I feel like you’re getting younger…. You’re ageless!” He then asked how she does it since he feels like he’s aged “about 10 years in the past year,” which is how long he’s been hosting “The Late Late Show.”

“What happened was, my life blew up,” said the glowing chanteuse with a bright white smile surrounded by fierce red lips. “After that, I kinda started falling in love. Then I wrote a whole record about that.... So that’s what the facelift is, I think…. I’m writing music about happiness and truth.”

Stefani, of course, was referring to her new album “This Is What the Truth Feels Like,” which came out in March and was inspired by her divorce from Bush frontman Gavin Rossdale and her new relationship with boyfriend Blake Shelton.

Stefani’s 2006 smash “The Sweet Escape” was sung next. But when it came time for the faster part of the song, Corden admitted he had no idea what the words were. She then said the lyrics slower so the TV host could try to understand them. After hearing the lines twice, Corden - always the pro - was able to perfectly sing them along with her.

Corden then asked Stefani if it’s true that she loves using emojis, which she confirmed. “They’re right up my alley,” she said. He then called out some emojis and asked her to make faces corresponding to them, which she adorably did.

The two then sang two more of her songs: “Used To Love You” and “Rich Girl.”

Soon they were approaching an HOV-4 lane. Realizing he needed two additional people in his car, Corden made a quick phone call. A few second later, Clooney got into the car. “You owe me big time for this one,” the actor said.

However, another person was still needed. Clooney then phoned a friend. Shortly after that, Roberts - his co-star in the upcoming film “Money Monster” - joined them. The two actors buckled their seat belts, and the foursome were on their way.

With everyone settled in the vehicle, it was time to do some more singing. “Hollaback Girl” came blasting out of the speakers, and they all hilariously sang along with exaggerated facial expressions and dance moves. When asked what exactly is a “Hollaback Girl,” Stefani said, “The real inspiration behind that song, I would never say.” That totally shocked everyone in the car. “All I’ll say is, I won,” she added.

An epic rendition of Queen’s “We Are the Champions” ended the one-of-a-kind car ride.

Watch “Carpool Karaoke” with Corden, Stefani, Clooney and Roberts in its entirety below: