WHY WE LOVE IT: Since red is a bold contrast to blue, this striking shade makes blue eyes really pop. It also creates a beautiful backdrop for fair skin.
WORKS BEST FOR: Blondes are the best candidates for going red because the dye penetrates the cuticle easier than on dark strands. Cunningham, who also works with Ali Larter, explains, "Dark hair color has to get stripped away with peroxide or ammonia before you can apply the red dye." Red hair also tends to be most flattering on light, almost milky complexions.
MAKE IT YOUR OWN: If you have fair skin, you can pull off any red, from strawberry blond to brick. Darker skin tones look less natural in lighter shades of red; instead, choose a deeper hue in the red spectrum as a subtle highlight in dark hair.
STYLIST TIP: A sulfate-free shampoo strips less pigment, so color lasts longer.Read MoreLess
Sexy Cuts, Bold Color: Star Styles That Work for You