Former "American Idol" minx KATHERINE MCPHEE was photographed making out with Michael Morris . . . who directed her TV show "Smash". And both of them are married to OTHER PEOPLE. (Check out the pics here.)
Morris' wife is MARY MCCORMACK . . . whom you may remember from the cable series "In Plain Sight". They have three daughters, ages 2, 6 and 9. Katherine is married to a guy named Nick Cokas. They have no kids.
Since all of this happened IN PLAIN SIGHT . . . pun intended . . . it may not be a KRISTEN STEWART-type situation. Sources say Katherine and Nick have been separated for six months. There's no word on the status of Michael and Mary's relationship.