Cavallari's lived-in curls make this side-swept hairstyle perfect for someone who has places to go and people to see. To get this look, curl the bottom third of your hair -- don't apply too much product before curling so you get a more lived-in look. The twirl at the top of Cavallari's hair adds volume and enhances the beachy vibe. To get it, apply volumizing foam (try TreSemme 24 Hour Body Foaming Mousse, $5.50) and blow dry that area up away from your face.

Johansson's side-swept hairstyle works great on short hair. Curl your hair, twisting the curling iron outwards to create flirty face-framing finish. Sweep it over to one side, and apply a styling mousse and a few bobby pins (try TreSemme Flawless Curls Extra Hold Mousse, $4.50) to hold it in place.

Kruger's fishtail starts off near the top of her head, which gives the look more volume. To do the fishtail, secure hair into a pony and separate it into two sections. Take a small piece from the outside of the right section and add it the left section. Then take a small piece from the outside of the left section and add it to the right. Repeat these steps until you reach the ends of your hair -- as you reach the ends angle the braid over your shoulder to help it stay put. Don't want to learn how to master the fishtail braid? You can create this look with a French braid, too!

Liu's side bun is a great, no-hassle style. You can get the naturally tousled look by securing slightly damp hair into a tight bun and sleeping on it. Just re-secure it into a looser side bun the next morning, and you're ready to go! Or if you have a little more time, curl your hair with an iron, secure into a bun, and bobby pin the loose ends.

Ferrera perfects this romantic half-updo, and so can you. Take the top half of your hair and sweep it over to one side of your head (near your ear). Pin it into place with a large barrette or jeweled clip, and loosely curl the ends of your hair. Bobby pin any loose strands away from your face for a more polished look.