"She makes me think of Brigitte Bardot," Karl Lagerfeld is reported to have said of Charlotte Casiraghi, the only daughter of his close friend, Princess Caroline of Monaco—and that was when Casiraghi was just eight. With her famous lineage (maternal grandmother Grace Kelly was Hollywood and European royalty, of course), the young royal was always destined to turn heads. Now, at 20, she's come fully into her own. Fourth in line to the crown of Monaco, she stole the spotlight from her famous front-row seatmates at Chanel Haute Couture and Chloé this winter.

Casiraghi's faultless skin, burnished chestnut hair, and pillow lip pout—often stained a deep crimson red—make her an obvious pinup, but her real appeal lies in her demeanor: Despite being paparazzi prey, the young equestrian is refreshingly scandal-free—and so is her wardrobe. A closetful of Chanel helped her land a spot on Vanity Fair's Best-Dressed List last year. Look for other pretty young things to take a cue from Casiraghi this fall, now that designers (Nicolas Ghesquière and the jodhpurs he did for Balenciaga come to mind) have brought the award-winning show jumper's favored style to the runways.

— Alison Baenen