All About Eve (1950)
Broadway legend Margo Channing, aging but not gracefully, has everything: a successful career, close friends, a man who loves her. She also has a 'fan' named Eve Harrington, who manages to worm her way into Margo's life, in order to "study her like a blueprint". Eve's sweet facade is soon seen through by a number of people, most quickly by theater critic Addison deWitt, who decides to become her mentor. Eve achieves her goal of Broadway stardom, leaving a trail of unhappiness, but ultimately contentment, behind her.