08/31/2012 at 05:00 PM EDT
isn't the only member of her family experiencing relationship woes
actress's mom, Jules Stewart, filed for divorce on Aug. 17 from Kristen's dad, John, whom she married 27 years ago, according to documents filed in Los Angeles County Superior Court.
Jules, who cites irreconcilable differences as reason for the split, filed papers without an attorney. The documents state that the pair has been separated since June 15, 2010.
News of the couple's split comes a little more than a month after it was revealed that Kristen, 22, cheated on
longtime boyfriend Robert Pattinson
with her Snow White and the Huntsman
director, Rupert Sanders.
was first to report the divorce filing.