THE LOOK Pixie cut HOW-TO Rub a large dollop of sculpting serum in your hands and work through hair. Continue brushing through with a one-inch ceramic round brush pulling hair forward toward the face. Let hair air-dry. INSIDER TRICK Halle's hair is relaxed. "You can find a mild relaxer in a pharmacy that takes five minutes, but be sure to read the instructions well because it can burn your scalp," says stylist Marco Maranghello, who recommends getting hair professionally relaxed. BUY ONLINE NOW Paul Mitchell Super Skinny Serum, $21.32; cosmeticmall.com.