The British actress had spent most of her young acting life in smaller roles, from films like "Wrath of the Titans" and the TV shows "Secret Diary of a Call Girl" and "Just William." Then two big breaks came her way.
She was cast as the spunky Lady Rose in "Downton Abbey," a series that has been a massive hit for the BBC and PBS. In the middle of all that attention, she landed a film role that has turned her into a movie star.
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