Rooney Mara is topless three times in Una.
The first scene comes about five minutes in as she’s showering after a wild night out. Great view of her breasts (complete with piercing), straight on, well lit. The second scene comes about an hour in, both breasts as she’s lying on her back on the floor trying to have sex with another character. Then about ten minutes later you briefly see her left breast as she’s on top of another guy having sex.