Sienna Miller has reportedly been axed from new movie "Nottingham" because she would make Russell Crowe look "old and fat."

The 26-year-old actress - who had been cast to play Maid Marian in the 5 million re-imagining of the Robin Hood story - has been dropped from the film because it was feared lead star Russell would look out of shape in the love scenes.

A source told the New York Post newspaper: "It is a mess. Russell never lost the weight he put on for 'Body of Lies' and so the love scenes between him and Sienna would have been laughable. He's so old and fat and she's so young and gorgeous."

"Word is that producers are looking for an older, plumper actress to play the role so Crowe doesn't look like a paunchy grandfather. Someone in her late 30s or early 40s."

The 44-year-old star had to gain almost 50 lbs for his portrayal of a former journalist who hunts down terrorists from his armchair in "Body of Lies."

This is the second time Sienna has been dropped from a leading role recently. Director Guy Ritchie axed her from "Sherlock Holmes" in November after her ex-fiance Jude Law agreed to appear in the project.