Summer Hair: Gwen Stefani's Edgy Topknot

Stars are weatherproof their hair with easy, breezy 'dos that beat the heat! "Gwen Stefani's stylized knots keep the face and neck cool," says celeb hairstylist Lona Vigi, whose star clients include Drew Barrymore. Bonus? "The less precise it is, the cooler it looks."
Best for: Fine strands or processed hair that needs a break from heat-styling.
How to do it: Apply a soft wax to bangs or front layers, then braid and pin back. Pull hair into two ponies -- one high, one low. Divide each pony in two and knot them.