Jennifer Lawrence goes from blond to brown. Photos: Jason Merritt/Getty Images | Marcel Thomas/FilmMagic

Jennifer Lawrence is no longer a blond bombshell.

The 20-year-old actress has dyed her locks brown for her role as the heroine Katniss Everdeen in the science-fiction film "Hunger Games."

Lawrence's dramatic hair transformation was first revealed on this week's cover of Entertainment Weekly, but the Oscar-nominated star was spotted outside the "Late Show With David Letterman" yesterday sporting her new dark mane.

Center-parted and styled in loose curls, Lawrence's brunette strands make her blue eyes pop.

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Vote in our poll and click here to see another hot young star who stepped out in a noticeably darker and shorter hairstyle.