She revealed she was first sexually harassed by Weinstein over the phone in 2014.
“When I first started to work as an actress, I was working on a film and I received a call from Harvey Weinstein asking if I had slept with any of the women I was seen out with in the media,” she began her post. “It was a very odd and uncomfortable call."
Delevingne said she answered "none of his questions" and tried to hurry off the phone as quickly as she could.
"But before I hung up, he said to me that if I was gay or decided to be with a women specifically in public, that I’d never get the role of a straight woman or make it as an actress in Hollywood," she continued.
A few years later, Weinstein invited her to a hotel to "discuss" a potential movie role.
Delevingne met Weinstein and a director in the lobby of a hotel for the meeting.
But as soon as the director left, Weinstein pressured her into coming up to his suite.
Delevingne tried to decline Weinstein's invitation, but she said she felt powerless in the situation.
"I quickly declined and asked his assistant if my car was outside," she explained. "She said it wasn't and wouldn't be for a bit and I should go to his room. At that moment I felt very powerless and scared but didn't want to act that way hoping that I was wrong about the situation."
When Delevingne arrived to Weinstein's room, she was initially relieved to see another woman.
"When I arrived I was relieved to find another woman in his room and thought immediately I was safe," she recalled.
But then Weinstein tried to force her into having a threesome.
"He asked us to kiss and she began some sort of advances upon his direction," Delevingne revealed. "I swiftly got up and asked him if he knew that I could sing. And I began to sing.... I thought it would make the situation better....more professional....like an audition.... I was so nervous."
She continued, "After singing I said again that I had to leave. He walked me to the door and stood in front of it and tried to kiss me on the lips. I stopped him and managed to get out of the room."
Delevingne made it out of Weinstein's hotel room, but she didn't escape unscathed.
"I still got the part for the film and always thought that he gave it to me because of what happened," she confessed. "Since then I felt awful that I did the movie. I felt like I didn't deserve the part. I was so hesitant about speaking out....I didn't want to hurt his family. I felt guilty as if I did something wrong. I was also terrified that this sort of thing had happened to so many women I know but no one had said anything because of fear."