The actress will play the soprano in Greek Fire, based on a book about the singer...
And she admits it's a role she couldn't turn down - because Gosford Park screenwriter Julian Fellowes penned the script specifically for Mendes.
She tells Britain's The Independent, "Julian Fellowes wrote a script for me based on the relationship between Maria Callas and Aristotle Onassis, and as Julian Fellowes wrote it for me I couldn't say no to it."
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