George Clooney and Julia Roberts join Gwen Stefani and James Corden for Carpool Karaoke George Clooney and Julia Roberts join Gwen Stefani and James Corden for Carpool Karaoke http://bit.ly/1WKGmpf Share this:TwitterFacebookLike Loading... Related George Clooney and Julia Roberts join Gwen Stefani and James Corden for Carpool Karaoke