Laura Linney in The Other Man (2008). There is a reason this is blurry and low-res. This was a shot of a screen-within-the-film. We see a computer screen as a guy was viewing stills. That also raises the possibility that it wasn’t Laura. That said, I think it was she.
Besides, this was during Linney’s long run of nudity in role after role. It’s her personality to obsess. She had a kind of nude scene bug for quite awhile.
There’s no upside to doubting this particular instance. It wouldn’t affect her stats much. It goes contrary to where she was at & was going in her career. I mean, it happened right in front of us.
Let’s keep the focus on questions like was Sarah Bolger wearing a g-string & by what means was it blurred out? These questions advance the arguments both for & against butt cheeks being actual nudity. I’m against, BTW, but the opposing side can make a good case.