D'entre a suya filmografía, se puet destacar as suyas interpretacions en bellas cintas como Roman Holiday (1953, William Wyler), Sabrina (1954, Billy Wilder), War and Peace (1956, King Vidor), Love in the Afternoon (1957, Billy Wilder), The Nun's Story (1959, Fred Zinnemann), Breakfast at Tiffany's (1961, Blake Edwards), Charade (1963, Stanley Donen), My Fair Lady (1964, George Cukor), Two for the Road (1967, Stanley Donen), u Wait Until Dark (1967, Terence Young).