Celebrities with Blue HairJuliette Lewis' new hair color heralded a new trend in Hollywood chic. From Katy Perry and Gwen Stefani to Ryan Phillippe and Kate Winslet, click on our gallery of blue-haired stars.Updated Jul. 14, 2017 5:45PM ET / Published Aug. 17, 2010 1:04PM ET Chris Pizzello / AP Photo