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Katharine McPhee has filed for divorce from her estranged husband Nick Cokas, seven months after she was caught kissing married director Michael Morris.

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The couple, which wed in 2008, had reportedly been separated for some time before the star was photographed locking lips with her Smash director Morris.

McPhee sparked rumors of a reconciliation with Cokas in March when they were spotted together in public for the first time since the scandal, but she has now filed legal papers to end the union.

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A statement issued by her representative reads, "After six years of marriage, and having been separated for the past year, Katharine McPhee has filed for a dissolution of marriage from Nick Cokas. The two have an amicable relationship and will remain friends. They ask that people respect their privacy during this time."

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Neither McPhee nor Morris have commented on their brief fling, but the director has since reunited with his wife, actress Mary McCormack.