The American Psycho author recently revealed that he would be interested in turning E.L James's bestselling erotic fiction into a film.
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Ellis later added on Twitter: "Okay. Today the team has been briefed and we will be approaching the studio this week about BEE adapting Fifty Shades of Grey into a film.
"Thanks to everyone supporting BEE adapting Fifty Shades of Grey: the response has been huge and amazing. Hope E.L. James feels the same way.
"The casting of Christian in Fifty Shades of Grey wouldn't be up to me but I have certain actors in mind. And a particular actress for Ana."
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He continued: "I think David Cronenberg is a great idea for directing Fifty Shades of Grey and we worked together on American Psycho in its initial phase.
"Cronenberg and Alexander Skarsgård is a no-brainer. I've seen Alexander naked so many times at the gym that we both attend: perfect casting.
"For Fifty Shades of Grey: David Cronenberg, Alexander Skarsgård, Bret Easton Ellis and who as... Anastasia???
"I would love it if we lived in a world where Lena Dunham could be Ana in Fifty Shades of Grey but I don't think we do. I think she's hot."
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Ellis added: "Tonight's epic fight on Girls between Allison Williams/Lena Dunham convinced me that either one of them could play Ana in Fifty Shades of Grey.
"Thinking more conventionally for Ana in Fifty Shades of Grey: Scarlett Johansson or Kristen Stewart. Alex Pettyfer as Christian: too young?
"Aaron Johnson as Christian Grey? In a perfect world it would be Ryan Gosling as Christian Grey...
"David Cronenberg directing. Bret Easton Ellis writing. Ryan Gosling acting. Fifty Shades of Grey team... Shades of Grey."
