Which Teen Mom Star Posed Shirtless For a Sexy Santa Pic? (PHOTO)

Well, guys, we'll never look at Santa Claus the same way again. Why, you ask? Because Teen Mom's most gorgeous co-star took it to Twitter with a shirtless pic, in which she's decked out in nothing but a bra, a Santa hat, a few cheerful Christmas lights.

Intrigued? We'll give you a hint. This gal is dating one of Teen Mom's hottest baby daddies, and she's a professional model. So, who is she? Click here!