All this week, we've been bringing you the real dish behind Hollywood's most gorgeous faces—who cuts their hair, how their skin gets that glow. And now, another big reveal: Why Emma Stone always looks so great, no matter what color her hair is.

The mastermind behind Stone's genius color changes is none other than Tracey Cunningham, also the go-to colorist for Fergie, Cameron Diaz and Jessica Biel.

Emma Stone, Tracey Cunningham

Brian Dowling/MTV/PictureGroup via AP IMAGES; Frederick M. Brown/Getty Images

Her specialty: offering top-notch blowouts along with signature color. Her uncanny secret talent: Predicting what the season's next hot hair shade will be. For example, this spring, you can count on seeing a whole lot of honeyed blondes on the red carpet. And when you spot one, you'll have a good guess as to who's behind the look!

When it comes to her success, Cunningham has one living legend to thank. The colorist started out as a nanny for Bette Midler's daughter. Eventually Cunningham, now owner of the Beverly Hills salon Meche, persuaded the singer and actress to let the nanny do her hair...and the rest is hair hue history.

We're not done with our lineup of Hollywood's best beauty experts. Check in with E! News all this week for more tips, tricks and secrets straight from the red carpet.

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