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According to TMZ, Lohan lost the role because she wasn't considered to be a "bankable" name.
Thirlby has appeared in only a few movies, including Juno and indie drama The Wackness.
She recently joined the cast of sci-fi thriller The Darkest Hour and is in talks to co-star in an upcoming Ivan Reitman romantic comedy, with Natalie Portman and Ashton Kutcher.
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