Tresemmé hairstylist Lona Vigi wanted to create a "sleek yet edgy" updo for Cameron Diaz to match her Stella McCartney ensemble. First, she sprayed Platinum Strength Heat Protect Spray ($5) on damp hair, pointing the nozzle down for extra smoothness. Then she added dry shampoo at the roots for height. "I'm a huge fan of dry shampoo in general, but being that I recently colored Cameron's hair, both of these products not only protected the color, but enhanced it," she said. Finally, she combed the hair straight back into a knot just behind the ears.