The 17-year-old actress is a standout on Heroes, playing a Texas high school cheerleader who bounces back from any mutilation. "She constantly has body parts falling off, getting chewed up or popped out—so it's been fun," says Panettiere, who's dating TRL host Stephen Colletti, 20. He has his own special power: "He's a good conversationalist, which I adore. There's nothing worse than sitting in a car with someone where you have to bring something up."
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