There are a number of reports, stating that Scarlett Johansson has nude scenes, including some full-frontal) in Under The Skin, which has screened at Telluride and just today has screened at the Venice International Film Festival.
Here is a Hollywood Reporter review mentioning the full-frontal nudity:
"Johansson herself is not the source of the film's problems. She totally commits to the part, to the extent that she even performs several scenes of full-frontal nudity. Unfortunately, many, if not most, of the people who ultimately will check out this film will probably do so solely in order to check out those scenes."