Gene Kelly at the Paris Opera, 1960 | Gene Kelly: Rare Photos of a Song and Dance Legend | LIFE.com

Not originally published in LIFE. Gene Kelly rehearses with ballerina Claude Bessy, Paris, 1960.

Gene Kelly 1944 | Gene Kelly: Caught in the Act | LIFE.com

Gene Kelly 1944 | Gene Kelly: Caught in the Act | LIFE.com

Gene Kelly 1944 | Gene Kelly: Caught in the Act | LIFE.com

Ralph Crane—Time & Life Pictures/Getty ImagesNot published in LIFE. Twiggy at Disneyland during her first visit to the U.S., 1967

Ralph Crane—Time & Life Pictures/Getty ImagesNot published in LIFE. Twiggy in California, 1967

Ralph Crane—Time & Life Pictures/Getty ImagesNot published in LIFE. Twiggy, Sonny and Cher and others dance at a party in Beverly Hills, 1967

Paul Schutzer—Time & Life Pictures/Getty Images -- John and Jackie Kennedy, Massachusetts, 1960

Ralph Crane—Time & Life Pictures/Getty ImagesNot published in LIFE. Twiggy and furry friends at Disneyland during her first visit to the U.S., 1967

Not originally published in LIFE. Jackie Kennedy in India, 1962.

Ralph Crane—Time & Life Pictures/Getty ImagesNot published in LIFE. Twiggy with boyfriend and manager Justin De Villeneuve (kissing her) and Sonny and Cher (right) at a party thrown for the English supermodel in Beverly Hills, 1967.

Ralph Crane—Time & Life Pictures/Getty ImagesNot published in LIFE. Twiggy with boyfriend and manager Justin De Villeneuve at Disneyland during her first visit to the U.S., 1967

Gene Kelly and Fred Astaire

Gene Kelly + Fred Astaire

Ralph Crane—Time & Life Pictures/Getty ImagesNot published in LIFE. Twiggy and friends (including boyfriend and manager Justin De Villeneuve) at Disneyland during her first visit to the U.S., 1967

Paul Schutzer—Time & Life Pictures/Getty Images -- Kennedy on the stump, October, 1960.

Gene Kelly & Debbie Renyolds from Singing in the Rain

Bruce Lee (1966) by MsBlueSky: "My dad said time was the most valuable thing a person had." - Brandon Lee From Life's "Legends".

Tiny dancer