TMZ Live 01/04/13: Justin Bieber & Selena Gomez -- Breaking Up Happens a Lot

JWOWW swears on her fake tan that a picture showing her with a chunky butt was Photoshopped -- so she released a video of her barely-covered backside to prove everyone wrong! Point, JWOWW? Plus, New York Jets coach Rex Ryan reveals he's got one of the weirdest tattoos of all time -- which looks like his wife wearing Mark Sanchez's jersey. No wonder Tim Tebow didn't get many snaps. And, the OMG moment on Howie Mandel's new show when a chick nearly suffered the ultimate diss from her boyfriend. The couple from "Mobbed" joins us!

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