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The actress will play an American divorcee, who meets and marries a British man on the spur of the moment.
The couple then have to return to the UK and confront their parents with the news.
Easy Virture is based on a Noel Coward play, and has been adapted for the big screen once before by Alfred Hitchcock.
Ben Barnes will play Biel's British husband, while Colin Firth and Kristin Scott-Thomas will have the role of Barnes' parents.
The movie is due to start shooting next week in London.
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