The music video for Justin Bieber and Mariah Carey's "All I Want For Christmas Is You" is here ... and, is it just us, or is it a little creepy?

The video opens with 17-year-old Bieber shopping with his friends for holiday gifts -- as 41-year-old Mariah flirts with the young pop star while wearing one very skimpy Santa Claus costume!

It's also packed with product placement, screaming fans and one of Mariah's Jack Russell terriers.

What do you think of the clip?

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