Hayden Panettiere Debuts Dramatically Different Hair [PHOTO, VIDEO]

Hayden Panettiere has always been a blonde, but yesterday she showed off brand-new platinum locks with eyebrow-grazing bangs.

Paps snapped photos of the 'Nashville' star on her way into a taping of the 'Late Show with David Letterman,' and Hayden herself also tweeted out a selfie of the new 'do, writing, "#McQueen #NYC." Which refers to the Alexander McQueen mini she's wearing and her locale, of course, but doesn't address the startlingly different hair.

We've gotta say that it -- and the vampy red lips the 24-year-old actress was also sporting -- certainly ages her and makes her look a lot less girl-next-door, and maybe that was the point. But if several beauty blogs are to be believed, it's just a wig anyway.