Betty Noyes
Elizabeth Betty Noyes Hand was a singer and actress best known for dubbing the singing voice of Debbie Reynolds in the 1952 film Singin in the Rain. Today, this is a wellknown example of dubbing in a movie musical ironically, Reynoldss character in Singin in the Rain was supposedly dubbing for another character. She is also known for singing the song Baby Mine in the Disney film Dumbo , which was nominated for the Academy Award for Best Original Song. However, she was not given screen credit for this performance.
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Source: Wikipedia