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Who did Judy Holliday play in the 1950 film Born Yesterday?

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In the 1950 film Born Yesterday, Judy Holliday played the role of Billie Dawn. Billie Dawn was the mistress of a low-class tycoon named Harry Brock, and her character undergoes a transformation as she educates herself and realizes she has been exploited. Holliday's performance in this role earned her an Academy Award.1