The Lodge (2019)

A woman left alone with her partner’s sons in an isolated mountain chalet during the winter holidays finds herself trapped in a spiral of psychological terror. The sons, who refuse to accept their father’s new partner, begin to manipulate reality until the boundaries between what is true and what is not begin to crumble.
At the 40-minute mark, Riley Keough steps out of the shower, revealing her naked body. She walks in profile, and we see her breasts and round buttocks. At the 61-minute mark, the actress, topless, sees her breasts reflected in a mirror fogged by steam.