Sienna Miller to Play Depp's Gangster Moll

Earlier today we learned that Benedict Cumberbatch and Adam Scott had joined the cast of the Johnny Depp true crime drama Black Mass. Now the official announcement of principal photography reveals a bevy of other notable actors filling out the cast's ranks -- and refers to the movie the Untitled Whitey Bulger Film, suggesting it may not be titled Black Mass after the non-fiction book it's based on after all.

Johnny Depp as Whitey Bulger and director Scott Cooper on the Boston set of Black Mass.

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