By InStyle Staff
Updated Apr 15, 2012 @ 9:00 am
Allison Williams, Girls
Credit: Derek Storm / Splash News

At the premiere of HBO’s Girls in New York City, Allison Williams (daughter of newsanchor Brian Williams) showed off her perfect frizz-free waves. “To create these sexy, cascading waves for Allison, I started off with a blow drying spray on the scalp and then smoothed gel through the ends,” her hairstylist Ted Gibson told, adding that he used products from his own line ( He then wrapped one-and-a-half inch sections around a large barrel curling iron. “I finished off with a light hold hairspray for instant sex appeal.” We love it!

Plus, see more celeb-inspired hair ideas!