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Her first role was together with her sister in Lipstick (1976), for which she was nominated as "Best Newcomer" for the Golden Globe.
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Mariel is married to director Stephen Crisman, they got married on 9 December 1984.
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She has the same birthday as Scarlett Johansson, Jamie Lee Curtis and Rodney Dangerfield.
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Her Chinese Astrological sign is a Ox.
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Her Astrological sign is Sagittarius.
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She has two daughters, Dree and Langley.
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In 1989, she was nominated for a Raspberry Award (Razzie) in the category of worst supporting actress for the movie Sunset.
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In 1980, she was nominated for an Oscar in the category of best actress in a supporting role for the movie Manhattan.
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Mariel is 6 feet tall.
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As a model her dress size was 4 (US).
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She got married to Stephen Crisman on December 9,1984.
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She grew up mostly in Ketchum, Idaho on her family's farm.
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She is the sister of Margaux Hemingway.
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She is the granddaughter of Ernest Hemingway.