Gabrielle Union, Emma Stone, Rooney Mara
Credit: JB Lacroix/WireImage; Jim Smeal/BEImages; Suntzulynn for LE/Splash News

A great haircut is just half the battle. What about how to style it each and every morning? Click through to check out these thirteen easy hairstyle ideas from stars like Gabrielle Union, Emma Stone, and Rooney Mara, and get ready to rock ponytails, buns, updos and more!