Donald O'Connor
Donald David Dixon Ronald O’Connor (August 28, 1925 – September 27, 2003) was an American dancer, singer, and actor who came to fame in a series of movies in which he co-starred alternately with Gloria Jean, Peggy Ryan, and Francis the Talking Mule. Perhaps his most famous performance was as Gene Kelly's sidekick in the musical Singin’ in the Rain (1952).