Matt Damon knew Harvey Weinstein had sexually harassed Gwyneth Paltrow.

Harvey helped propel Damon and his good friend Ben Affleck to fame by producing their movie 'Good Will Hunting' through his former company Miramax and Damon has admitted he was aware of some of Weinstein's transgressions but insists he had no idea about the sexual assault allegations.

Matt Damon and Gwyneth Paltrow in 2000. Photo / Getty
Matt Damon and Gwyneth Paltrow in 2000. Photo / Getty

"Suburbicon" star Matt, 47, told "Good Morning America": "I knew the story about Gwyneth [Paltrow] [being sexually harassed by him] from Ben, because he was with her after Brad [Pitt]. I never talked to Gwyneth about it. Ben told me. I knew that they had come to whatever agreement or understanding, she was the first lady of Miramax. He treated her incredibly respectfully. Always."

Paltrow, 45, recently came forward to reveal the disgraced producer had made unwanted advances towards her when she was 22 and filming "Emma", but she went on to make a number of other movies with him afterwards, including her Oscar-winning "Shakespeare in Love".

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Harvey Weinstein (L) and Quentin Tarantino in 2013. Photo / Getty
Harvey Weinstein (L) and Quentin Tarantino in 2013. Photo / Getty

Weinstein, 65, allegedly placed his hands on the blonde beauty's shoulders and suggested they head to the bedroom for massages.

She said: "I was a kid, I was signed up, I was petrified."

The star claims she refused his alleged advances and told her then-boyfriend Brad Pitt, who confronted the producer, and Harvey later asked Paltrow not to tell anyone what had happened.

She added: "I thought he was going to fire me."

Co-Chairman of The Weinstein Company Harvey Weinstein (C) and tv personality Heidi Klum (back, L) and actress Uma Thurman (front, L) attend The Weinstein Company Party. Photo / Getty
Co-Chairman of The Weinstein Company Harvey Weinstein (C) and tv personality Heidi Klum (back, L) and actress Uma Thurman (front, L) attend The Weinstein Company Party. Photo / Getty

Since a string of sexual assault and harassment allegations were made against Weinstein, he has been fired from The Weinstein Company and his wife of 10 years, Georgina Chapman, decided to leave him. He is now seeking treatment in a rehab facility in the US.

Meanwhile, Damon also revealed that he knew Weinstein was a bully and a philanderer.

He said: "You had to spend about five minutes with him to know that he was a bully and he was intimidating. That was his whole kind of MO. When people say 'everybody knew', yeah I knew. I knew he was an a******e. He was proud of that. I knew he was a womaniser.

Gwyneth Paltrow and Matt Damon attend the premiere of movie Contagion. Photo / Getty
Gwyneth Paltrow and Matt Damon attend the premiere of movie Contagion. Photo / Getty

"I wouldn't want to be married to the guy. This level of criminal sexual predation was not something I ever thought was going on."