Former THE O.C. star MISCHA BARTON has replaced British actress SIENNA MILLER in the cast of new movie BHOPAL: A PRAYER FOR RAIN. The Alfie actress had been lined up to take the female lead in the film, which focuses on the story of a chemical spillage in India. But now 22-year-old Barton will join former West Wing star Martin Sheen in the picture, which is due for release later this year (08).
