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Who's that girl?! That couldn't possibly be Hayden Panettiere, could it? Debuting blunt bangs, stick-straight hair and a platinum blonde 'do, the Nashville star had all eyes on her vampy new look outside the Late Show with David Letterman in New York.

The petite 24-year-old certainly looks ready for the fall with her edgy style. The actress even opted for ruby red lips, liquid eyeliner to add to the drama. For the late night taping, the former Heroes star selected a skin-tight, body conscious mini-dress and paired them with red-hot ankle boots.

On Nashville, Hayden plays Juliette Barnes, a country crooner and former teen star star who will do anything to replace Rayna Jaymes (Connie Britton) as the queen of country music. Nashville's sophomore season begins September 25 on ABC.