Cohen, 27, said that she met Westwick, 30, through her boyfriend at the time, a producer who goes unnamed in the post. The incident occurred when the couple went over to actor’s apartment one night, she wrote.
Cohen was taken aback when Westwick allegedly suggested “we should all fuck,” but her boyfriend convinced her to stay for dinner to avoid making their host uncomfortable. At Westwick’s suggestion, Cohen said she then retired to the guest room for a nap while her boyfriend tried to smooth things over.
“So I went and laid down in the guest room where I eventually fell asleep, I was woken up abruptly by Ed on top of me, his fingers entering my body. I told him to stop, but he was strong,” Cohen wrote. “I fought him off as hard as I could but he grabbed my face in his hands, shaking me, telling me he wanted to fuck me. I was paralyzed, terrified. I couldn’t speak, I could no longer move. He held me down and raped me.”
See photos of Ed Westwick:
Ed Westwick out and about
Ed Westwick out and about
BEVERLY HILLS, CA - SEPTEMBER 16: Ed Westwick attends the BBC America BAFTA Los Angeles TV Tea Party 2017 - Arrivals at The Beverly Hilton Hotel on September 16, 2017 in Beverly Hills, California. (Photo by David Crotty/Patrick McMullan via Getty Images)
SAO PAULO, BRAZIL - JULY 15: British actor Ed Westwick poses during the Daydream Convention at Transamerica Hotel on July 15, 2017 in Sao Paulo, Brazil. (Photo by Patricia Devoraes/Brazil Photo Press/LatinContent/Getty Images)
LONDON, ENGLAND - MAY 14: Ed Westwick poses in the Winner's room at the Virgin TV BAFTA Television Awards at The Royal Festival Hall on May 14, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images)
LONDON, ENGLAND - APRIL 26: Ed Westwick attends the launch of The Ned, London on April 26, 2017 in London, England. (Photo by David M Benett/Dave Benett/Getty Images for The Ned London)
LIVERPOOL, ENGLAND - FEBRUARY 20: In this handout image provided by the BBC, Ed Westwick, attends the TV buyers at BBC Worldwide's Showcase event on February 20, 2017 in Liverpool, United Kingdom. A host of fantastic celebrities wowed international TV buyers at BBC Worldwide's Showcase event in Liverpool. Now in its 41st year and attended by the world's top television buyers, this evening's red carpet gala featured global A-listers including Top Gear presenter Matt LeBlanc, Absolutely Fabulous stars Jennifer Saunders and Joanna Lumley, and White Gold's leading-man Ed Westwick. (Photo by John Rogers/BBC via Getty Images)
PASADENA, CA - JANUARY 13: Actors Phoebe Dynevor (L) and Ed Westwick of the series 'Snatch' speak onstage during the Crackle portion of the 2017 Winter Television Critics Association Press Tour at the Langham Hotel on January 13, 2017 in Pasadena, California. (Photo by Frederick M. Brown/Getty Images)
LOS ANGELES, CA - JANUARY 09: Ed Westwick arrives at the BAFTA Los Angeles Awards Season Tea at Four Seasons Hotel Los Angeles at Beverly Hills on January 9, 2016 in Los Angeles, California. (Photo by Steve Granitz/WireImage)
CULVER CITY, CA - JANUARY 09: Actor Ed Westwick attends Art of Elysium's 9th annual Heaven Gala at 3LABS on January 9, 2016 in Culver City, California. (Photo by Jason LaVeris/FilmMagic)
BEVERLY HILLS, CA - DECEMBER 05: Actor Ed Westwick attends the Brooks Brothers holiday party with St Jude Children's Research Hospital at Brooks Brothers on Rodeo Drive on December 5, 2015 in Beverly Hills, California. (Photo by Donato Sardella/Getty Images for Brooks Brothers)
LOS ANGELES, CA - NOVEMBER 18: Actor Ed Westwick arrives at LOUIS XIII Toasts To '100 Years: The Movie You Will Never See' at Sheats Goldstein Residence on November 18, 2015 in Los Angeles, California. (Photo by Jon Kopaloff/FilmMagic)
BEVERLY HILLS, CA - OCTOBER 30: Actor Ed Westwick attends the 2015 British Academy Britannia Awards at The Beverly Hilton Hotel on October 30, 2015 in Beverly Hills, California. (Photo by Jason LaVeris/FilmMagic)
NEW YORK, NY - OCTOBER 22: Ed Westwick discusses his role in ABC's new drama 'Wicked City' during the AOL Build Series at AOL Studios In New York on October 22, 2015 in New York City. (Photo by Brook Christopher/FilmMagic)
NEW YORK, NY - OCTOBER 22: Actor Ed Westwick attends AOL BUILD presents 'Wicked City' at AOL Studios In New York on October 22, 2015 in New York City. (Photo by Ben Gabbe/Getty Images)
NEW YORK, NY - OCTOBER 22: (EXCLUSIVE COVERAGE) Actor Ed Westwick visits SiriusXM Studios on October 22, 2015 in New York City. (Photo by Slaven Vlasic/Getty Images)
BEVERLY HILLS, CA - SEPTEMBER 19: Actor Ed Westwick arrives at the BAFTA Los Angeles TV Tea 2015 at the SLS Hotel on September 19, 2015 in Beverly Hills, California. (Photo by Amanda Edwards/WireImage)
BEVERLY HILLS, CA - AUGUST 04: (EDITORS NOTE: This image has been digitally altered) Actors Erika Christensen (L) and Ed Westwick from ABC's 'Wicked City' pose in the Getty Images Portrait Studio powered by Samsung Galaxy at the 2015 Summer TCA's at The Beverly Hilton Hotel on August 4, 2015 in Beverly Hills, California. (Photo by Maarten de Boer/Getty Images)
BEVERLY HILLS, CA - AUGUST 04: Chace Crawford and Ed Westwick arrives at the Disney ABC Television Group's 2015 TCA Summer Press Tour on August 4, 2015 in Beverly Hills, California. (Photo by Steve Granitz/WireImage)
BEVERLY HILLS, CA - AUGUST 04: Actor Ed Westwick speaks onstage during the 'Wicked City' panel discussion at the ABC Entertainment portion of the 2015 Summer TCA Tour at The Beverly Hilton Hotel on August 4, 2015 in Beverly Hills, California. (Photo by Frederick M. Brown/Getty Images)
LONDON, ENGLAND - JUNE 27: Ed Westwick at the inaugural Walkabout Foundation gala, drinks by Boujis, London at Natural History Museum on June 27, 2015 in London, England. (Photo by David M. Benett/Getty Images for the Walkabout Foundation)
OXFORDSHIRE, UNITED KINGDOM - JUNE 01: Ed Westwick arrives for a talk with students at Oxford Union on June 1, 2015 in Oxfordshire, England.
PHOTOGRAPH BY Greg Blatchford / Barcroft Media (Photo credit should read Greg Blatchford / Barcroft Media via Getty Images)
NEW YORK, NY - MAY 12: Actor Ed Westwick attends the 2015 ABC NY Upfront Presentation at Avery Fisher Hall at Lincoln Center for the Performing Arts on May 12, 2015 in New York City. (Photo by Mireya Acierto/FilmMagic)
LOS ANGELES, CA - APRIL 25: Actors Ed Westwick (L) and Chace Crawford attend City Year Los Angeles Spring Break at Sony Studios on April 25, 2015 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images for City Year Los Angeles)
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“It was a nightmare, and the days following weren’t any better,” she added.
A representative for Westwick did not immediately return HuffPost’s request for comment.
Cohen said that her boyfriend blamed her for the assault and cautioned against speaking out against Westwick for the sake of her career.
Over the years, she has appeared in a handful of minor roles in projects including “Californication” and “The Middle,” as well as the web series “Ladies Like Us.” Westwick rose to fame on the hit CW soap playing bad boy Chuck Bass, a character with his own history of sexual assault. He now stars on the BBC Two series “White Gold.”
Cohen said the wave of sexual assault allegations leveled against powerful men in Hollywood pushed her to come forward with her story now. She hopes to change the public perception of men like Westwick and encourage other victims of sexual assault never to blame themselves.
“I’m sickened to see men like Ed respected in such a public way. Interviewed by prestigious platforms such as the Oxford Union Society at Oxford University, where he was honored as one of their ‘People who Shape our World,’” Cohen wrote. “How does this end? Men like Ed using fame and power to rape and intimidate but then continue through the world collecting accolades.”
“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 concluded.