If Your Hair is: Straight and Fine like Keira Knightley

InStyle.com: Find Your Perfect Haircut

THE CUT: A long bob with blunt ends that are snipped shorter in the back makes fine strands look full and dense. "Longer pieces around the face give the cut versatility, allowing you to play with updos," says Knightley's stylist, Ben Skervin.

STYLING SECRET: The part is central to this style, so place it where it will best frame your face: In the middle it creates the illusion of length for square or round faces; to the side it offsets long or oval shapes.

SHORTCUT TO GORGEOUS: When hair is still damp, run a drop of gel from roots to ends and tuck strands behind your ears. "The look is quite sleek at first, but as it dries you get a nice bend in the front," says Skervin.

KEY TOOLS: Bumble and Bumble Bb gel, $25; bumbleandbumble.com. Aveda Air Control hairspray, $24; aveda.com. GHD Gold Professional 1-inch flatiron, $225; sephora.com.

(CREDIT: Pascal Le Segretain/Getty Images)

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If Your Hair is:...

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If Your Hair is:...

THE CUT: Add some oomph (and sexy movement) with feathery layers that start at the jaw, advises Greene's mane man, Ted Gibson. "The pieciness in front will prevent the density of the hair from overpowering your face," he says.

STYLING SECRET: Apply a straightening cream to wet hair and divide it into 3-inch sections. Dry with a flat paddle brush, pulling hair outward and holding the blow-dryer perpendicular to it.

SHORTCUT TO GORGEOUS: Don't bother starting from scratch," says Gibson. "It's easier to work the straight look on second-day hair." Simply mist the top layer with shine spray and flat-iron in 2-inch sections. KEY TOOLS: Kérastase Nectar Thermique, $39; kerastase-usa.com. Mark Salon Straight Shine spray, $6; meetmark.com. Ted Gibson flatiron, $175; tedgibsonbeauty.com.

(CREDIT: Rabbani and Solimene Photography/Getty Images for IMG)

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If Your Hair is:...

THE CUT: A medium-length style with uneven ends keeps hair bouncy and full; side-swept bangs add polish, according to Stone's stylist, Mara Rozak. However, don't let your stylist use a razor, as blunt tips look thicker and healthier.

STYLING SECRET: Dry bangs with a large round brush the minute you step out of the shower. Apply a dollop of texturing lotion to the back, scrunch with fingers, and allow waves to air-dry.

SHORTCUT TO GORGEOUS: "This is already such a low-maintenance style," says Rozak. But if you don't want to leave home with damp hair, twist it into a chignon and let it air-dry. "Shake out dry strands for perfectly tousled texture." KEY TOOLS: Bumble and Bumble Surf Spray, $24; bumbleandbumble.com. Leonor Greyl Eclat Naturel cream, $43; leonorgreyl.com. Ibiza round brush, $48; ibizahair.com.

(CREDIT: Jon Kopaloff/FilmMagic)

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THE CUT: Long layers sliced all around the head prevent the "triangle" effect that you get from a blunt cut. "I use thinning shears on Kelly's ends to give the waves lightness and movement," says stylist Mark Townsend.

STYLING SECRET: Towel-dry and apply a leave-in conditioner from the mid-shaft down to preserve volume at the roots. Blow-dry with your fingers, then define waves with a 1½-inch iron.

SHORTCUT TO GORGEOUS: Let clean hair dry overnight, then wrap 2-inch pieces around steam rollers, twisting all the way to the scalp. After 15 minutes, remove rollers and smooth the ends with shine serum.

KEY TOOLS: Dove Nourishing Oil Care Leave-In cream, $5; drugstore.com. Oribe Heat Styling spray, $42; oribe.com. Caruso Molecular steam rollers, $12; drugstore.com.

(CREDIT: Ray Tamarra/FilmMagic)

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If Your Hair is:...

THE CUT: Dense curls need weight to keep them from ballooning around your face, so go for a style that falls below your shoulders, suggests Neal Farina, who works with Knowles. Ask for uneven ends to avoid a bottom-heavy effect.

STYLING SECRET: Run frizz serum through damp strands, blow-dry with a diffuser, and use a curling iron to define spirals from the ears to the ends (as opposed to starting at the scalp).

SHORTCUT TO GORGEOUS: Reactivate the spirals around your face by placing them in pin curls and misting with a medium- or strong-hold hairspray. Keep pins in for about five minutes, then shake loose.

KEY TOOLS: Oribe Super Shine serum, $49; oribe.com. L'Oréal Paris Elnett Satin Strong Hold hairspray, $15; at drugstores. Enzo Milano curling iron, $130; enzomilano.com.

(CREDIT: Cindy Ord/Getty Images for Mercedes-Benz Fashion Week)

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