Achieving Cameron Diaz's straight, glossy blow-out not only requires the right tools -- a blow-dryer with a nozzle and a large round brush -- but also the right techniques Here's the low-down:

Get her look: Work in a straightening balm or shine serum to towel-dried hair. Blow-dry hair, working with your hands, until your hair is 80% dry. Continue to blow-dry (with the nozzle aiming downwards onto hair to prevent frizz) using a round brush, pulling hair taut as you dry from root to tip. Finish with a blast of cool air to lock in the style and a bit of shine serum to the ends.

A half-up keeps things cool and girly in summer! We love Ashley Greene's extra-romantic half-up that is pretty enough to wear to a wedding party or a big date.

Get her look: Blow-dry hair using a large round brush, wrapping sections around the brush and blast with hot air to create soft waves. Pull hair at the sides back into a half-up and secure with bobby pins or a pretty clip.

Jessica Biel's sexy multiple layers has that slightly just-rolled-out-of-bed feel but still looks glam enough to wear to a big event. It's sophisticated and fun rolled into one!

Get her look: Make a center part and blow-dry hair with a round brush. Wrap hair ends around the brush, like a roller, and blast with heat, then unroll after about 5 seconds when it has cooled. Rub a little pomade between your hands and lightly scrunge the ends for a piecey look.

Taylor Swift ditches her signature wavy mane in favor of a sleek, straight finish. To get her glossy strands, apply a heat protectant product (try Kerastase Heat Protectant Spray) prior to styling.

Get her look: Spritz heat protectant spray to wet hair, then blow-dry straight with a paddle bush. Follow with a flat iron and a pea-size amount of pomade from the middle to the ends of the hair to add shine.

If you have fine or thin hair, less layers will make your mane fuller. To get Kristen Bell's cut, ask your stylist for minimal layering at the ends with shorter layers in front.

Get her look: Make a center part and blow-dry hair straight with a paddle brush. Finish by scrunching a beach spray in for a little extra volume and lift.