Focus Features said last week casting had not started yet for the big-screen adaptation of the erotic bestseller. However, buzz built during the weekend the 22-year-old former "Harry Potter" heroine is set to play Anastasia Steele in "Grey."
"Who here actually thinks I would do 50 Shades of Grey as a movie? Like really. For real. In real life," Watson tweeted during the weekend.
"Good. Well that's sorted then."
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