She then appeared in other very successful musicals such as Lili ( 1953 ) , for which she won a BAFTA Award for best actress , The Glass Slipper ( 1955 ) , Daddy Long Legs ( 1955 ) , opposite Fred Astaire , Gaby ( 1956 ) and Gigi ( 1958 ) . She also starred in the successful musicals Lili ( 1953 ) , with Mel Ferrer ; Daddy Long Legs ( 1955 ) , with Fred Astaire , and Gigi ( 1958 ) with Louis Jourdan and Maurice Chevalier .