The 24-year-old actress, who was apparently snapped by a member of the public while filming Passion Play, vowed to "personally" cause whoever took the pictures "physical harm".
She told Metro: "If I knew who took this picture, I would personally cause them harm - physical harm.
"I'm not a f**king reality TV star that's courting the paparazzi and wants my f**king picture taken all the time."
Fox added: "I'm at my job and I'm trying to play a character and I'm trying to be serious, and this is the s**t that's happening to me. It makes me furious."
