Demi MooreTHE LOOK Beachy waves HOW-TO This style works for anyone with soft, wavy hair, says stylist Xavier Cruz. Start with a curl-enhancing product, running through the hair with your fingers, and let air dry. You can finish the ends with a small amount of shine serum to keep them from frizzing. INSIDER TRICK "You can use a diffuser, but keep in mind that causes curls to expand," says Cruz. BUY ONLINE NOW Nexxus Alluring Curls Curl Enhancing Styling Elixir, $13; ulta.com.