We spend each week scouring the red carpets for the best (and worst) in beauty, from gorgeous coral lips to oddly lopsided hair.

But this week we barely needed to scour at all: it's Cannes, people! Red carpets abound!

So for today's This Week In Beauty, we're honing in on our favorite Cannes glamour girls (Frieda, Jessica, Eva) and talking about hair. With multiple premieres and parties a day, celebs are trying out more hairstyles in a week than we do in a year.

So which styles work best: sleek updos or free-flowing locks? Vote in our slideshow below.

Loading Slideshow...
  • Freida Pinto

    Pinto opted for a sleek ponytail for the premiere of "De Rouille et D'os." The day before she wore a messy updo for the screening of "Moonrise Kingdom." Which do you like better? (Getty/AFP photos)

  • Eva Longoria

    Eva tried a very messy beehive for the "Moonrise Kingdom" premiere... but the next day let her elegant hair down for "De Rouille et D'os." Which do you love? (Getty photos)

  • Marion Cotillard

    Marion Cotillard chose to wear her hair half-up, half-down for a Cannes photocall but went dramatic at the "De Rouille et D'os" screening with a giant bun. Which works best? (Getty/AFP photos)

  • Jessica Chastain

    During the photocall of "Madagascar 3: Europe's Most Wanted," Chastain wore her red locks soft and loose. Just two days before during the "Moonrise Kingdom" screening, she pulled things up in a chic updo. (AFP photos)

  • Diane Kruger

    Kruger showed up to her photocall with beachy waves but later that night decided to wear a tight bun to showcase her face. Do you like things up or down? (Getty/AFP photos)

  • Hao Lei

    Chinese actress Hao Lei wore a long braid for her photocall... but later that night wore a full updo complete with a diamond hairpiece for the premiere of "De Rouille et D'os." (AFP/Getty photos)

  • Virginie Ledoyen

    French actress Virginie Ledoyen showed up to one screening with a tight updo and the next night let her wavy locks hang down to the side. Which looks best? (AFP/Getty photos)