Kristen Stewart hadn’t become Bella in the “Twilight” series when she signed on to star in “The Runaways.” But between the time she agreed to play rocker Joan Jett in the bio-pic about the ’70s all-girl band and its box office debut, Stewart had become a movie star.

The film, released last spring, is available Tuesday on DVD.

Stewart’s sudden rise to fame had her thinking about the difference between what Jett, singer Cherie Currie and the other Runaways experienced in the ’70s and what she’s gone through in the past few years.

“I think they sought out their fame so aggressively that it was completely different thing,” she said in an interview when the film was released. “It’s not like it was thrust upon them at all. … Musicians really are themselves all the time, in a public way. We’re not. We’re actors. We choose movies for a million different reasons; some of them are because they ‘say’ things. But not the way music does, not so directly. I can say, ‘This is really cool, I’m really lucky.’ They’re like, ‘We own this.’”

Dakota Fanning, who has been famous since she broke into movies at age 7, said fame in the ’70s was far different from what she and Stewart experience today.

“Back then you had to do something really important to become famous. That’s what you really wanted,” Fanning said. “Now I feel like you can do anything and become famous.”

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