Fourteen-year-old fashion blogger Tavi Gevinson started her blog, Style Rookie, in 2008 when she was just 11. A combination of runway images that inspire her, photographs of her own outfits and funny commentary on everything from Lady Gaga to her favorite movies, her blog became a virtual scrapbook. Thanks to Tavi's avant-garde style, wise-beyond-her-years writing and sharp sense of humor, she's now considered a huge force in the fashion world. Proof: The design duo Rodarte used her as a muse for their Target line, she's written for Harper's Bazaar and has scored the cover of Pop Magazine.