What's the most recent Christmas song that you think is or will become a classic?

[N-OS X-tasy!]

I am particularly fond of Mariah Carey's "All I Want For Christmas Is You" (featured in the film Love Actually). It's the one Christmas song I look forward to hearing on the radio during the season. They play the hell out of it, so I would have to say it is already well on its way to becoming a holiday classic.

EDIT: Apparently I'm not the only one to feel this way:

Critically, "All I Want for Christmas Is You" has been lauded, with The New Yorker calling it "one of the few worthy modern additions to the holiday canon."

http://en.wikipedia.org/wiki/All_I_Want_...mas_Is_You
http://en.wikipedia.org/wiki/All_I_Want_..._reception