"I was sleeping one night on location and I woke up and he was filming me", she revealed, "I was clothed, but it was a very voyeuristic, terrifying thing to do".
The actor spoke about her experiences with a makeup artist who continued to harass her for months despite her complaints. However, she was left stunned when they instead broached an incident of her dog defecating in her dressing room, telling her "this is very serious and we can't have this happen again".
Lively took the ordeal into her own hands and went to a lawyer to report the harassment.
It's understood that the make-up artist is still an active member of the industry.
However, Blake has claimed the team's production manager still wrote a positive letter of recommendation to the disgraced make-up artist so he could work on another project because they didn't want any "bad blood".
Lively made a statement Tuesday regarding the allegations of sexual misconduct surrounding Hollywood producer Harvey Weinstein.
Blake hadn't had a similar experience, but told The Hollywood Reporter earlier this week: "That was never my experience with Harvey in any way whatsoever, and I think that if people heard these stories..." I do believe in humanity enough to think that this wouldn't have just continued.
She continued, "It's important that women are furious right now".
Actress Blake Lively arrives for Variety's Power of Women luncheon in New York City, U.S., April 21, 2017. Many actresses, including Gwyneth Paltrow, Ashley Judd, Kate Beckinsale and Angelina Jolie have spoken out about their experiences with Weinstein's alleged inappropriate behavior.