Hayden Panettiere is about to be on your small screen every week, as the second season of 'Nashville' premieres Sept. 25. She's a familiar face on the boob tube, but the actress looks a little different in real life these days, thanks to a dramatic change to her hair.

Panettiere appeared on 'The Late Show with David Letterman' on Aug. 28, showing off heavy, eyebrow-skimming bangs and golden, stick-straight locks. While the blonde hue is something we're used to seeing on her, the cut most certainly isn't. It's a bit extreme (and is likely a wig).

She paired her new hair (real or not) with berry-stained lips, which is an overall more mature, sultry presentation for her. The actress just turned 24 earlier this month, but she's growing up as she experiments with her look.

It's a dramatic and sexy change. We're left to wonder if her 'Nashville' character Juliette Barnes will rock this look, too. Guess you'll have to tune in to Season 2.

Watch Hayden Panettiere on ''The Late Show With David Letterman'