Guess Hayden Panettiere got the memo: blunt bangs are hot for Fall. But whereas getting fringe for the change of season is common, what's usually not quite as common is going lighter with one's hair color. While making an appearance on Late Show With David Letterman, Hayden showed off a much blonder, blunt-banged style. The actress topped her edgier look, which is quite a departure from her signature honey-blond waves, with royal-blue nails — Dermelect's Phenom ($14) as a base with Fearless ($14) layered on top — and an equally bright dress. While it could be a wig, what's your take on Hayden's newly lightened coif?