5th Ave Girl

5th Ave Girl is a 1939 comedy film about a millionaire who feels neglected by his family, so he hires a young woman to stir things up. It stars Ginger Rogers and Walter Connolly.

Feeling lonely, he goes to Central Park, where he meets Mary Grey Ginger Rogers, a young, outofwork woman. Seeing that she has only a meager meal to last the day, he invites her to dine with him at a fancy nightclub. They get drunk, start dancing, and are spotted by Martha and her boyfriend. The next morning, he awakes with a hangover and a black eye, to discover that he had apparently invited Mary to spend the night in a guest room.Seeing the reaction this elicits from his formerly indifferent family, he concocts a scheme he hires Mary to pretend to be his mistress. He neglects his company, forcing his son to take up the slack. Tim comes up with fresh new ideas to save the firm. Meanwhile, Borden and Mary go out every night, supposedly partying to all hours, though they are actually just driven around by the ardently Communist chauffeur Mike James Ellison. Embarrassed by the resulting newspaper gossip column items and shunned by her friends, Martha first calls family psychiatrist Dr. Kessler Louis Calhern, but he finds nothing wrong with her nowcheerful and carefree husband. She starts staying home, plotting ways to drive Mary out. She has Tim try to buy her off, but that fails. Tim makes no effort to hide his contempt for the interloper, but eventually, he falls in love with her. Meanwhile, Mary tries to help Katherine, who is in love with an unnoticing Mike. ........

Source: Wikipedia