Justin Bieber and Carrie Underwood Lead All-Star 'Christmas Carpool Karaoke'

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The Late Late Show went carpool caroling!

The show's band leader, Reggie Watts, drove around with host James Corden as the two reminisced about singing with some of music's biggest stars in a festive "Carpool Karaoke" segment.

Starting their own "Christmas Carpool," the guys burst into song when "Joy to the World" came on the radio. The late-night CBS show also got Justin Bieber, Carrie Underwood, Jason Derulo, Iggy Azalea, Rod Stewart, Stevie Wonder and One Direction to sing the classic holiday track when they participated in they were previously in the car with Corden. 

WATCH: James Corden Reveals His Dream 'Carpool Karaoke' Guests

If "Christmas Carpool" doesn't get you in the holiday spirit, nothing will!

Earlier this week, Directioners had lots to celebrate when 1D joined the host in his SUV for a singalong to the group's hits.

EXCLUSIVE: One Direction's Harry Styles Reveals Pre-Fame Aspirations - 'I Wanted to Be a Lawyer'

Niall Horan also got the Selena Gomez relationship rumors going again when he agreed to play a quick game of "Shag, Marry, Cruise." Check it out: 

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