True Confessions - S3.E18

Cybill stalks Maryann in order to research a new role and discovers a jaw-dropping secret. When Cybill decides to base her character in Ira's new play on Maryann, she immediately begins to shadow Maryann's every move. But, when Maryann tells Cybill that she's not welcome to accompany her one afternoon, Cybill secretly follows her anyway. When she spies Maryann suspiciously meeting a man at his apartment, Cybill assumes that her friend is having an affair, only to discover that Maryann has been posing as a nude model.