She and her co-star in Just Like A Woman, Golshifteh Farahani, leave their husbands and flee across country, Thelma & Louise style, bound for Las Vegas where they get jobs showing off their navels.
Sienna told me months ago that she had been looking forward to working with Just Like A Woman director Rachid Bouchareb (who made the fantastic Outside The Law, which is out now) since they met last year.
Filming begins in July on locations in Chicago and Santa Fe.
There are negotiations about taking Flare Path to Broadway next year, along with Sienna and her superb fellow leading actors Sheridan Smith, James Purefoy and Harry Hadden-Paton.
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Sienna Miller will swap the stage for belly-dancing
