Mia Grey | Rita Ora

Role: Christian Grey's bubbly, adoptive sister Mia Grey Actress: Rita Ora Where you've seen her: The British singer is best known for her vocal chops and had few acting credits to her name, save for an uncredited appearance in "Fast & Furious 6" and a cameo in "90210" before signing on to "50 Shades."
Joel Ryan / Invision / Associated Press
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