THE LOOK Major '70s volume HOW-TO Inspired by Lopez’s dramatic Versace gown, stylist Robert Vetica created a sexy disco-era coif. This textured look began with an application of Moroccanoil Treatment in the singer's wet hair. Vetica created a middle part, then blow-dried her locks smooth with a large round brush. Using a 1” iron, he created small curls then combed through them to loosen the spirals. He finished by backcombing the layers around her nape for maximum fullness. INSIDER TRICK Get perfect curls with good technique: Start in the back and pull the spirals down as you work towards the front. BUY ONLINE NOW Oil Treatment, Moroccanoil, $39; moroccanoil.com.