Chapman and Weinstein have two children together.
On Monday, People reported that sources say Chapman is "really mad" but "not even really at Harvey." Apparently, the designer is worried about the impact on Marchesa.
Marchesa did not respond to Business Insider's request for comment.
"They both benefited from the relationship, but she certainly knew about his bad behavior," an L.A. fashion publicist told the Hollywood Reporter.
next slide will load in 15 secondsSkip AdSkip AdAllegation's against Weinstein have surfaced before. In 2015, Chapman was reportedly "furious" and embarrassed after an Italian model claimed Weinstein groped her. She never released a public statement on the incident.
The Weinstein Co. produces Project Runway, which debuted in 2004. Chapman appeared as a judge on "Project Runway: All Stars" starting in 2012.
Weinstein has long been friends with Vogue chief Anna Wintour. Both Weinstein and Chapman were front-row fashion show fixtures.
It was rare for a red carpet not to feature at least one Marchesa gown.
Chapman's acting career was short lived. However, her dresses continued to flood the red carpet and pop up on magazine covers.
next slide will load in 15 secondsSkip AdSkip AdChapman had a stint as an actress, appearing in "Factory Girl," "Derailed," "Grindhouse," and "The Nanny Diaries" — all films executive produced by Weinstein.
"Eager to help Chapman, Weinstein strongly suggested that the stars of his movies wear Marchesa gowns for big events," the New York Times wrote in a profile of stylist Rachel Zoe in 2007. "I also put the gowns on my girls,' Zoe said."
"Marchesa designer Georgina Chapman has declared that she wants everyone to be wearing her frocks to the Emmys this year," New York Magazine's Daily Intelligencer blog wrote in 2007. "Don’t worry, GC: We’re sure Harvey Weinstein will make sure anyone with even the most remote silver-screen aspirations won’t have any other choice."
"Competitors complain that Marchesa dresses are worn on the red carpet because the stars and their agents, managers and lawyers need to please the powerful Weinstein, who, along with his brother, has just started his own film company," the Los Angeles Times wrote in 2006. "Say the word 'Marchesa' and publicists groan."
Rumors circulated that many stars were wearing Marchesa as a favor to Weinstein.
next slide will load in 15 secondsSkip AdSkip AdMarchesa quickly caught on in Hollywood, with stars including Diane Kruger and Cate Blanchett wearing Marchesa dresses on the red carpet.
"Maybe I helped, but just very, very little, with Renée Zellweger,” Weinstein told Vogue in 2013.
A 2007 Teen Vogue article — spotted by Jezebel — notes that Marchesa caught on with Hollywood starlets after Renée Zellweger wore a gown from the line to the premiere of "Bridget Jones". "Bridget Jones" was distributed by Miramax, and Zellweger thanked Weinstein during her Oscar speech in 2004.
Georgina Chapman founded Marchesa with Keren Craig in 2004. The same year, the 28-year-old English former model began dating Weinstein.