Your Most Stylish Year Ever

"Get shiny hair by shampooing with lukewarm water and finishing with a cool rinse," says Michael Murphy, who has trimmed and styled Katie Holmes's tresses. "This will seal the cuticle and give a more reflective quality to the hair." When the cuticle is closed—which happens when it's cold and it opens when it's warm and humid—the hair lays flat and therefore has more surface area to reflect shine and give the appearance of lustrous locks.