HILARY DUFF
Last year, Duff, then 17, hadn't left her teen-queen roots behind (left). Today, the singer-actress (in Zac Posen, center, and Alessandro dell'Acqua) looks every inch the young mogul she is. "She's gone from being overaccessorized to simplifying and letting her own personality stand out, rather than layering herself in thousands of necklaces and bangles," says Kaufman.