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Lauren Conrad does it best: beachy, tumbly, subtle and fun.

Charlotte Free: sexy in a slept-in-a-cotton-candy-machine kind of way.

Nicki Minaj channels Barbie full-on.

Dianna Agron's shag is super-cute and the pink streaks are subtle.

Katy Perry's rose-colored roots create a fresh kind of ombre.

Kate Bosworth goes green in a totally new way.