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Rex Features
The former Lizzie McGuire star's casting in a remake of Dunaway's 1967 film Bonnie And Clyde reportedly prompted the actress to remark: "Couldn't they at least cast a real actress?"
Speaking to E! News, Duff retorted by saying, "I might be mad if I looked like that too," adding that none of her fans would even know who Dunaway was.
Appearing on The Bonnie Hunt Show, Duff admitted that her insults were mean, but insisted that "it's not okay for people to take stabs at you and to say mean things for no reason".
The 21-year-old added that Dunaway failed to appreciate that she was only young and still learning, saying: "She started acting way later than I did, so I think I have time to grow with each project. I am learning and work hard at my craft."
The Story Of Bonnie And Clyde, starring Duff and Kevin Zegers, is scheduled for release in 2010.
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