Marcia Gay Harden Files for Divorce

Marcia Gay Harden has decided to end her marriage.

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After 15 years of marriage, the Oscar winning actress has filed for divorce from her husband, Thaddaeus Scheel, her rep tells PEOPLE exclusively.

"For the sake of the couple's three children, Harden would like to request that the family's privacy be respected at this time," the rep says in a statement. "No further comments will be made on this matter, and we thank you for your understanding."

The actress and Scheel have 7-year-old twins and a 13-year-old daughter.

Harden, 52, won the Best Supporting Actress Oscar in 2001 for Pollock. She was also nominated for Best Supporting Actress for Mystic River in 2004. Most recently, she won a Tony Award in 2009 for God of Carnage.