Runaways role cements Fanning's move away from child films
But Fanning was keen to tackle more hard-hitting roles, and was overjoyed to win the leading part in the rock biopic.
She tells America's Parade magazine, "I can be sweet little Dakota Fanning, and then I can be totally different in the movies.
"A big reason I wanted to do The Runaways was to do something unlike anything that I've done before. I'm ready to have people see me in a different way than like the kid in I Am Sam.
"You have to kind of grow up. Everyone has to do it. I am doing it through films, which may be more difficult but it's what I love to do."
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