What we wouldn't give to be in the back seat!

Justin Bieber absolutely killed it with his performance at the Grammys on Sunday, but we think his carpool karaoke session with James Corden after the award show was even better! The singer and the late night host donned matching white tuxedos as they drove back to the Late Late Show studio, and they just couldn't resist getting down to Bruno Mars' "Uptown Funk."

The funniest part? When they open their swag bags from music's biggest night, only to discover that The Biebs has tons of pricey loot while the British funny man got nothing but trinkets.

In case you missed it, JB brought the house down with Skrillex to their song "Where Are U Now." Watch it below!