WATCH: It's just George Clooney singing Hollaback Girl with Gwen Stefani and Julia Roberts for Carpool Karaoke
Not content with one top star sharing a ride with him, James Corden managed to bag three for his latest, brilliant Carpool Karaoke.
Joined by Gwen Stefani in the passenger seat, The Late Late Show presenter also picked up George Clooney and Julia Roberts.
Having tackled No Doubt's Don't Speak and her solo hit If I Was a Rich Girl together, Gwen and James were joined by Clooney and Roberts to sing Hollaback Girl and Queen's We Are the Champions.
Clooney volunteered to explain what Hollaback Girl means.
“Ain’t No Hollaback meaning if some guys are on a construction site and they’re yelling at a girl, she’s not going to turn back, she’s not that kind of a girl,” he said.
"That's pretty close, yeah," said Stefani, who went on to say she would never reaveal the true meaning behind the song. "All I'll say is I won," she added cryptically.
"This shit's bananas," said Clooney. "B A N A N A S."
Corden compared Stefani to Benjamin Button and described her as "ageless". He said his wife wanted to know her secret.
"My life blew up and after that I kind of started falling in love and I wrote a whole record about that," she said. "That's what the facelift is I think."