The Los Angeles Police Department is investigating an allegation by actress Kristina Cohen that she was raped by Gossip Girl star Ed Westwick three years ago - an allegation that the British actor has denied. 

US entertainment trade publication The Hollywood Reporter says that Cohen filed a report at the LAPD's Hollywood precinct, having earlier posted the allegation on Facebook.

The Hollywood Reporter says it saw the police report for verification and that the LAPD is investigating the allegation that the "suspect forced victim to have sexual intercourse inside his residence ... three years ago".

Westwick took to social media to deny the allegation, writing: "I do not know this woman. I have never forced myself in any manner, on any woman. I certainly have never committed rape."