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HAYDEN PANETTIERE

Was a cast member of: Heroes
Now headlining: Nashville, premiering Oct. 10

The blonde beauty has ditched her cheerleading uniform (and sci-fi posse) to embrace a different kind of superpower: her voice. As Connie Britton's younger rival in the ABC musical drama, she'll head to Music City to play Juliette Barnes, whom she describes as "very diva-ish and bratty and snotty sometimes."