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Watson will co-star in film with Dominic Cooper and Michelle Williams.
Emma Watson has landed a role in a new film based on Marilyn Monroe's career.
The movie will recount the true story of when Monroe starred in The Prince and The Showgirl with Laurence Olivier.
Watson will play Lucy, a wardrobe assistant, whist the role Marilyn has gone to Michelle Williams.
The role is quite small and a far cry from Hermione in Harry Potter, but it will mark a departure from teenage parts for Emma.
Dominic Cooper, Kenneth Branagh, Judi Dench and Eddie Redmayne.