Katharine McPhee is having an affair with Smash Director, both are married

Katharine McPhee is dating her former "Smash" director Michael Morris, TMZ has learned ... and they're even making out in public -- problem is, THEY'RE BOTH MARRIED TO OTHER PEOPLE. 

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Morris is married to actress Mary McCormack (who played Howard Stern's wife in "Private Parts") ... and they have 3 young daughters together, ages 2, 6 and 9.

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29-year-old Katharine is married to 47-year-old producer Nick Cokas -- they have no children.

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Sources close to Katharine and Nick tell TMZ ... the two have been separated for 6 months and are living apart. They were married in 2008.


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SOURCE: TMZ

it just seems extra sad to me when one or both parties have really young kids, his youngest daughter is just 2 :/