She Loves and Lies (1920)

When Marie Callender is left a fortune by a wealthy old admirer on the condition that she marry the man she loves, Marie targets Ernest Lismore but is too shy to ask him to marry her. Instead, Marie disguises herself as an elderly woman of considerable wealth and offers to bail Ernest out of his impending bankruptcy in exchange for marriage, with the understanding that if Ernest ever falls in love with another woman she will grant him a divorce. Then Marie disguises herself as June Dayne in order to make her husband fall in love with her. She succeeds, and when Ernest confesses his love for another woman, Marie discards her disguise and Ernest discovers that the woman with whom he is in love is his own wife.