WATCH: Mariah Carey sings karaoke in James Corden’s car

With James Corden’s big move to the U.S, we can imagine he’s taking time to get used to the Los Angeles life - especially the traffic.

So, who better to make him feel at ease on his way to work Wednesday morning but Mariah Carey.

James - who clearly is a huge fan - took immediate advantage of the situation by cranking up the radio and introducting Mariah to some carpool karaoke.

Corden put the radio on and as the opening bars of 'Always Be My Baby' began to play, in which Carey promptly announced, "I'm not singing today. I was up all night."

Little did that last, as she belted some whistle notes while Corden threw some funny looking shapes.

The pair then tried their hands at some accents, and the Brit quizzed the singer on how many number one’s she has.

*Cue some Corden and Carey flirting*

"You're so hot. Stop it," the chat show host said to her as she took off her sunglasses, giving him a sideways glance and a smile.

"I'm a married man. You've gotta stop what you're doing, cause I know exactly what you're doing. Oh my goodness. I can read you like a book."

Watch The Late Late Show sketch here: