"Gossip Girl" star Ed Westwick of raping her three years ago.
In a lengthy Facebook post Cohen alleged that the rape occurred at Westwick's apartment.
Cohen said she met Westwick for the first time when she visited the 30-year-old actor's apartment with her then- boyfriend who was friends with him.
She said she wanted to leave after Westwick made some sexual comments, but stayed
back as her producer boyfriend did not want to make the "White Gold" actor feel awkward.
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"I said I was tired and wanted to leave, trying to get out of what was already an uncomfortable situation. Ed suggested I nap in the guest bedroom. The producer said we would stay for just another 20 more minutes to smooth everything over, and then we could leave.
"I was paralysed, terrified. I couldn't speak, I could no longer move. He held me down and raped me," Cohen wrote.
The "Ladies Like Us" actor said the producer she went with, put the blame on her, "telling me I was an active participant. Telling me that I can't say anything because Ed will have people come after me, destroy me, and that I could forget about an acting career."
Cohen said she feels "sickened" to see "men like Ed respected in such a public way."
The actor said she hopes her coming forward will help other to know they are not alone and are not to blame.
"Just as the other women and men coming forward have helped me to realise the same. I hope that my stories and the stories of others help to reset and realign the toxic environments and power imbalances that have created these monsters," she wrote.
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