Britney Spears Shows Off Her Abs and Peek-a-boo Tattoos While Wearing Sweats and a T-Shirt

Britney Spears knows that if you want a hot body, you better work. But what's the point in having said body if you can't show it off -- even when you're having a low-key night at home? On Friday, the 35-year-old pop princess shared an Instagram photo of herself dressed in her most comfy clothes -- a cropped athletic T-shirt and blue sweats, which she accessorized with red sweatbands and a black choker. Though the outfit looked cute, it was Spears' killer abs and hip-tattoos that stole the shot -...