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

REESE WITHERSPOON

Trends may come and go, but Vanity Fair star Witherspoon, 28, is "classic all the way," says Kaufman. "She's got a really great, clean sense of style." The actress (left, in Alberta Ferretti; right, mixing denim with a cropped jacket) favors designers like Valentino and Chanel, but "always the more tame looks."