Gwen Stefani’s Carpool Karaoke might top all that came before it…thanks to George Clooney and Julia Roberts

Pity the person who comes next in Carpool Karaoke, because this is a tough act to follow.

Just when you thought James Corden couldn't top his Carpool Karaoke segment, he goes and pulls in some A-List celebs to join in the ride. Firstly, he had the amazing Gwen Stefani singing some of her biggest hits. If that wasn't good enough then George Clooney and Julia Roberts hop in the back seat and join in the sing-song. https://twitter.com/JustJared/status/728102891588755458 The Hollywood stars give their own special performances of Hollaback Girl and We Are The Champions. So much talent in one car. Watch it here: https://www.youtube.com/watch?v=F2SXmzk8ve4 Bar. Raised. https://twitter.com/latelateshow/status/728086515780177926     Image and video via YouTube/The Late Late Show with James Corden