Gladys Knight played by Gabrielle Union
She got a little nuts with the baccarat tables in the 1980s, but otherwise, doe-eyed singer Gladys Knight, left, keeps it clean. A leader in the Mormon church, Knight is also known for her Christmas duets with Johnny Mathis. Who can project such innocence on the silver screen? Gabrielle Union, right, who honed her chops in teen movies including 10 Things I Hate About You. (Motown / AP)
Casting Motown greats
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