The Los Angeles Times reports that Sienna Miller has dropped out of Ridley Scott’s Nottingham, the upcoming Robin Hood epic film.

While the reason for Miller’s departure wasn’t clear, inside sources claim that one of the reasons may be the age difference between the actress and star Russell Crowe. It is combined with the fact that Crowe has not lost the weight he put on for Body of Lies.

“Producers are looking for an older, plumper actress to play the role – someone in her late 30s or early 40s” said the source.

The film will begin shooting this April and is scheduled for release in 2010.