Give yourself a raiseliterally. If backcombing isn't enough to give you Maria Menounos' enviable bump, here's a way to cheat it: Pull the top half of your hair straight up over your headas if you were creating a super-high half-ponyand secure the elastic halfway between your roots and your tips, so it's very loose. Then stuff the ends of your strands, along with the elastic, underneath the hair at the crown. Secure with a few bobby pins to create a modern-looking bouffant.
Source : http://www.cosmopolitan.com/style-beauty/beauty/advice/g1913/hot-hairstyles-work/