James Corden has attracted some of the biggest names in music to sit in his passenger seat for Carpool Karaoke but last night things went up a notch.

The latest instalment of the popular franchise saw Gwen Stefani joining Corden and singing No Doubt’s ‘Dont Speak’ as well as Stefani solo track ‘Used To Love You’ . The pair also tried to replicate emoji faces in real life.

SEE MORE: James Corden’s Five Best Carpool Karaoke Guests So Far

However, half way through the bit things changed when they reached a carpool lane and needed two extra bodies to keep moving. Corden called up a friend and agreed to pick him up. This wasn’t any old friend though, with George Clooney stepping into the back seat. He then called a friend of his own and Julia Roberts joined the party.

This being Carpool Karaoke, they all got singing Gwen Stefani’s ‘Hollaback Girl’ and a rousing version of ‘We Are The Champions’ by Queen.

Check it out below:

Clips of Corden driving around Los Angeles with musicians as they sing and chat together have proven hugely popular since the British actor took over as host of The Late Late Show last year. Coldplay, Adele, One Direction and Justin Bieber are among the artists who have taken part.

The most recent Carpool Karaoke saw Jennifer Lopez in the passenger seat as she showed off her best music video faces and talked about and insuring her butt.

Another Carpool Karaoke from this year saw Sia take part, singing songs including ‘Chandelier’ and ‘Alive’ as well as those she’s written for others, like Rihanna’s ‘Diamonds’, in the clip.