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Hollywood's Dazzling Dozen

PEOPLE's fashion expert Susan Kaufman picks the 12 most stylish starlets under 30 – and explains their appeal. By Serena Kappes

MISCHA BARTON

The O.C.'s Barton is "the new Sarah Jessica Parker, because (her) show is the show everyone's looking to for style tips," says Kaufman. The 18-year-old actress (from left: in Prada; in a fun slipdress; in a Sass & Bide shirt) is becoming a trendsetter off the set too: "It's not just a stylist dressing her."