Oona O'Neill and Charlie Chaplin. One of the most fascinating things about Chaplin to me is the relationship he had with his fourth wife, Oona O'Neill. Oona O'Neill was the débutante daughter of famous playwright Eugene O'Neill (and Gloria Vanderbilt's best friend). An aspiring actress, she met Charlie Chaplin when she was 17 and by 18 they were married. Chaplin was 54 years old. They remained married for 40 years and had 8 children, including the actress Geraldine Chaplin.