"A Carpool Karaoke Christmas," streaming Monday on Apple ... "This was hands-down the most fun I have ever had in a car. I'm very grateful to James for trusting me behind the wheel of a very ...

The Gavin and Stacy star either conquered the US or very much didn't depending on your school of thought, but one undeniable breakout success from his time stateside was Carpool Karaoke.

"Carpool Karaoke" is making a triumphant Christmas ... they're seen singing various Christmas songs while hanging out in Lowe's car, which is decorated with various Christmas ornaments.

The hour-long installment of the Emmy-winning “Carpool Karaoke: The Series” was put ... stopping to let the AC/DC singer into the car. “You want to hear something funny?” ...

Original host and creator James Corden also made sure to make an appearance after passing on the car keys. The actor and comedian, 46, gushed: 'I’m delighted Carpool Karaoke is back to celebrate ...

I'm very grateful to James for trusting me behind the wheel of a very expensive car with three of music's most exciting artists and I'm honored to be part of bringing this special 'A Carpool Karaoke ...