Both superstars arrived at Macy's for a night-long shoot directed by the wonderful Sanaa Hamri ("Crybaby") and got some some early Christmas shopping done!
One of Mariah's looks in the video was inspired by a vintage animated Christmas card.
Look out for a special surprise appearance by Mariah's puppy Jill E. Beans in the video!
"All I Want For Christmas Is You" Duet with Justin Bieber is available on iTunes now.