Bruno Mars will be performing on the "Big & Best of 2012" live stream, which just makes the whole thing sexier.

We're just one week away from the absolutely enormous "Big & Best of 2012" live stream, which is already positively PACKED with all-star performances and must-see pop culture countdowns and commentary, including performances by Alt-J and Metric, and the "Last Fans Standing" fan army showdown, just to mention a few ways we're gonna get buck. And not like those things aren't enough, because they are, but when Bruno Mars stops by with his new album, you make some room for the bro to come through.

On Tuesday, Dec. 11, at 7:55 p.m. ET on MTV, Bruno Mars will perform a unique, never-heard-before rendition of "Locked Out Of Heaven." The next day, during the "Big & Best of 2012" livestream, Bruno will perform his new single, "Young Girls," and sit down with MTV News' Sway and James Montgomery for a track-by-track preview of his new album, Unorthodox Jukebox. It's like Christmas is coming two weeks early. Also, is it just me, or did the Sex Dragon make this whole thing that much sexier?

Big & Best of 2012: A Year-End Celebration Presented by T-Mobile goes LIVE at 12 p.m. on 12/12/12. Watch at www.bigandbestof2012.com for 8 hours of LIVE performances by Grace Potter, Metric, Alt-J, Thompson Square, First Aid Kit, and Dustin Lynch, plus surprise guest appearances, prize giveaways, special editions of "RapFix Live," "Big Morning Buzz Live," "MTV News After Hours," "You Oughta Know" and much more!!

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