Gravity defying buns are taking over Hollywood, but they’re doable in real life as long as your hair is shoulder-length or longer. To get a sleek ballerina look like Jennifer Lopez right, smooth hair up into a high pony-tail, then wrap the tail around and pin into place. For Jessica Alba’s bun looser version, take the back of your hair, twist it up and around the center of your head, then pin and add a headband.