WEAR RED

WEAR RED...

Yes, it's that simple. A bit of crimson has the power to put men in a lusty state of mind—one study even found they were 56 percent more likely to ask out a woman in a red top versus a white one. That's because men are hardwired to respond to the hue: The color was used as early as 10,000 B.C. in lip color and blush to mimic the red flush we get when we're turned on. Throw on a red dress and let primal instincts take over.

MEDIUM SKIN Toffee

MEDIUM SKIN

Toffee

Jessica Alba's subtle, modern ombré is "dark at the top, but the bottom is ashy instead of bright," says O'Connor. To get this look, ask for sandy brown highlights blended over an espresso base. The shade may be muted, but it noticeably warms up medium complexions: "There's a really soft transition of color that gives it a golden feel," says O'Connor.

FAIR SKIN Ombré

FAIR SKIN

Ombré

Yes, we're still into ombré. More specifically, Jessica Biel's ombré. The varying dark-to-light shades blend together so there aren't any harsh lines. "The color actually threads to the top around her face," Josh says, which keeps it from looking severe around her fair skin. To steal Biel's look, ask your colorist for a medium brown base and stick within a two-shades-lighter range through the tips. A bonus styling trick from Josh: "Waves look the best with ombré," he says. "Worn straight, you can see how the color is painted in."

THE PROBLEM: BODY ACNE

THE PROBLEM: BODY ACNE

Since sweat and oil production ramp up in the summer, pores on your chest and back get clogged more easily. The best approach starts in the shower: Use a body wash with at least 1.25 percent salicylic acid (Neutrogena Body Clear Body Wash Pink Grapefruit contains 2 percent and doesn't smell medicinal). If that doesn't do the trick, once you're dry, add a layer of benzoyl peroxide (just remember, it can bleach clothes) or a prescription antibiotic lotion.

CAFFEINE

CAFFEINE

Produced in the leaves and seeds of various plants, it can also be made in a lab. Commonly used in cellulite creams and eye creams, it constricts blood vessels, reducing redness and puffiness.

FAIR SKIN Mahogany

FAIR SKIN

Mahogany

Katie Holmes's dark, even shade may be understated, but it's still rich. "It starts with a really chocolatey base, but there's a hint of ruby," says colorist Rona O'Connor. Ultradark shades can look goth against light complexions, but that little tinge of red has a big impact: "It comes through in thick ribbons, and because the shades are very close to each other, it looks really soft," says O'Connor.

DARK ASH BROWN

DARK ASH BROWN

"This is a pretty medium ash brown," says Robinson. "It makes [Katie Holmes's] eyes sparkle." When going dark, Robinson suggests that it's important to keep length—and height—in mind. "When you have long, dark hair and are tall in proportion to that, it looks elegant. But if you're petite, make sure it's not one length, because it will look overwhelming." Layering will add movement to your hair and stop it from hiding your face and body shape.