DO: Control your waves and let your hair down, like Jennifer Lopez who was promoting The Back-Up Plan in Paris, with a full-bodied, wavy hairdo.

DO: Try a dramatic, Old Hollywood do like Kate Hudson, at the Tribeca Film Festival Premiere of The Killer Inside Me.

DO: Glam and glossy hair with a bohochic look, like Jessica Alba at the Tribeca Film Festival Premiere of The Killer Inside Me.

DON’T: Pull your hair back too tightly, like Heidi Klum at the Los Angeles premiere of The Back-Up Plan.

DO: Finish off a loose updo with a cute headband, like Amanda Seyfried at the Tribeca Film Festival premiere of Letters to Juliet.

DON’T: Forget to use a defrizzing hair product, like Mickey Rourke at the Los Angeles Premiere of Iron Man 2.

DO: A messy updo with a super glam dress, like Scarlett Johansson at the Los Angeles premiere of Iron Man 2.

DO: Wear your hair straight and parted down the middle, like Gwyneth Paltrow at the Iron Man 2 premiere, but only if your color looks flawless!

DON’T: Wear embellished headgear if you are a dude, like Johnny Weir At The Hot Pink Party.

DON’T: Pile on the hair gel and wear your hair slicked back, like Heidi Klum at the Eva by Eva Longoria fragrance Launch.