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While Kristen Stewart's relationship with Robert Pattinson has been on the rocks, so has her parents' marriage.

According to TMZ, Kristen's mother, Jules Stewart, filed for divorce from John Stewart on Aug. 17 in Los Angeles County Superior Court. The "Twilight Saga: Breaking Dawn - Part 2" star's parents have been married for 27 years.

PHOTOS: Kristen's fling with Rupert

Jules, a writer/director, cited irreconcilable differences in her filing and listed the date of her separation from John, a TV producer/stage manager, as June 15, 2010, TMZ reports.

PHOTOS: Kristen and Rupert's road to scandal

Stewart, 22, has had her own relationship issues with her boyfriend of three years, Pattinson, 26, after she was caught cheating on him with her "Snow White and the Huntsman" director Rupert Sanders, 41, last month.

"She isn't sleeping and she stays up all night crying," a source recently told Us Weekly of Stewart. "She's close to a total meltdown."

PHOTOS: Rob and Kristen's romance

Will the "Twilight" costars be able to work things out and stay together?

"Right now their relationship isn't defined," an insider told Us earlier this month. "Rob's dealing with a lot of indecision ..."


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