"Bonnie and Clyde" was his second film. His first was the very strange "Mickey One", directed by Arthur Penn, where he co-starred with Hurd Hatfield, who had been MGM's pretty boy back in the Forties.
Beatty was in more than one film before Bonnie. His big break came in the classic "Splendor in the Grass" with Natalie Wood.
Jeez. "Splendor in the Grass." To think I saw that film last night on cable and forgot that Beatty had made it in '62. Thanks.