Nastia Liukin bared her buttocks with zero limits today while going backless and folding her Gold Medal legs. The 31-year-old five-time Olympic medalist, fresh from shutting down a troll over her "gross skinny chicken legs," proved there isn't a gross thing about her on Wednesday, updating for her 1 million Instagram followers in a jaw-dropping stool snap while looking towards "new beginnings." Nastia, who showed off her McPantless look for a Golden Arches street walk yesterday, is now back to bare-legged. Check it out below.