Angela Kinsey and Warren Lieberstein

Angela Kinsey's workplace romance is over: The star of The Office has filed for divorce from her husband, Warren Lieberstein, a producer and writer on the NBC sitcom.

Kinsey, 39, filed papers in Los Angeles County Superior Court on Thursday, citing irreconcilable differences, a court spokeswoman told TVGuide.com. The actress requested joint legal and physical custody of their 2-year-old daughter, Isabel.

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Kinsey and Lieberstein have been married for 10 years and separated in February 2009.

Lieberstein, 41, is the younger brother of Office producer, writer and star Paul Lieberstein (Toby).