THE LOOK Half-up HOW-TO Add volumizing spray to damp hair and create a disheveled center part, says stylist Rodney Cutler. "Using your hands, grab two-inch sections of hair and twist," he says. "Blow-dry while holidng the twist very taut. When the hair is dry, release it to create the sexy disheveled texture. Then loosely pull back the sides and secure in the back with bobby pins." INSIDER TRICK If your roots aren't perfectly touched up like Bosworth's, try a more jagged part partit helps to conceal undone roots.