Mischa Barton is being sued for $320k, according to TMZ, after failing to complete her role in upcoming flick "Promoted." Producers claim the former it-girl was unreachable in early March, when they were set to begin production, and caused thousands of dollars in losses.

"Promoted" was set to begin production March 4, but Barton did not return producer's previous calls to discuss costume sizes and other things pertaining to her role. On March 3, her mother explained Barton was busy in Europe and would be available March 20.

"The Sixth Sense" actress angered producers by sharing her trip on social media. "Promoted's" leading actor refused to work with another actress, so her absence had a "snowball effect" on production.

The site notes she is "being sued for the $20,000 advance she got, $200,000 in marketing expenses, and $100,000 which they say they will lose because Mischa's not attached anymore."

We told you earlier this month Barton's Beverly Hills mansion is facing foreclosure, after missing $100k in payments. She purchased the $7.1m home in 2005, when she played Marissa Cooper on Fox's "The O.C."

Barton put the house on the market for the first time in 2010, with a listing price of $8.695m. She originally bought it for $6.4m, and took out a $4.2m loan.

She did not receive any takers and relisted in 2011, only to experience the same outcome. Barton even tried to rent the place for $35k/month.

The 90210 abode boasts 1.2 acres of property, including eight bedrooms, 11 baths, and three guest houses.

Barton recently revealed she regrets playing Marissa Cooper, the role that made her a tabloid sweetheart and Hollywood it-girl.

"It's something I came so close to not doing. I had a really great thing with film. People say be grateful for what you have but it certainly not the kind of thing I was expecting it to be... I've kind of seen it all," she told Metro.

Can you believe Barton is being sued for failing to complete a role? Share your thoughts in the comments section below.