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The Burberry model will appear alongside Dustin Hoffman's son Jake in The Right Side Of My Exultant Brain.
Speaking about the role, Deyn told The Sun: "It's the first time I've actually had to speak. I kind of feel like a fish out of water and I'm finding a big pond to swim in.
"But I like opening up different channels and keeping myself interested."
The movie is written by musician Alanna Masterson.
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