During his long and illustrious career, Rooney also worked with many of the screen's female stars, including Elizabeth Taylor in "National Velvet" (1944) and Audrey Hepburn in "Breakfast at Tiffany's" (1961)." With his appearing with Marilyn Monroe in "The Fireball" (1950) and with Grace Kelly in "The Bridges at Toko-Ri" (1954), Rooney is the only actor ever co-starring with four of the greatest female screen legends ever. Rooney's "bumptiousness and boyish charm" as an actor developed more "smoothness and polish" over the years, writes biographer Scott Eyman. The fact that Rooney fully enjoyed his life as an actor played a large role in those changes: