Coldplay brought down the house by bringing James Corden on stage Friday night to perform "Us Against the World."
Chris Martin and Co. filled the Rose Bowl and Corden was a surprise guest ... with some history. Corden had Chris Martin on his show last year for a Carpool Karaoke sesh. And turns out the Rose Bowl is Corden's thing ... he performed there with Coldplay last year.
The band also played a tribute to Tom Petty with a "Free Fallin'" cover ... and the crowd went wild.