Two years later, Hepburn was chosen to play the lead role of a young princess in the Hollywood film Roman Holiday. It was a big success and Hepburn soon became world-famous. She won the Oscar for Best Actress for her role in this film that year. During her lifetime, Hepburn had four more Oscar nominations. In 1989, Hepburn made her final appearance in the film Always and played the role of an angel. Hepburn's achievements went beyond the film industry. She began to work for UNICEF in the 1950s. Hepburn spent her last few years working closely with UNICEF so that she could help poor children in different parts of the world. She won many awards because of her efforts in this area. In 1991, Hepburn discovered that she had cancer.