Hungtington-Whiteley was one of the first to rock a natural gradient.

"Babylights are very fine highlights that are one to one-and-a-half shades lighter than your natural hair," says de Souza. "They blend in beautifully with your natural color, giving the illusion of those natural highlights that we used to get when we were kids." You know, the sunkissed kind you had when you were 10 years old after a summer of running around outside.

The great thing about this fall hair color is that it's subtle, customizable and can work with any hair color. As for the process, it can be somewhat painstaking. Babylights require detailed handiwork, involving the application of fine highlights in closely placed foils. So, you're looking at anywhere from two to four hours in the salon.

Luckily, upkeep is minimal, especially if you stay closer to your natural color. De Souza says while some of his clients come in for touchups every eight to twelve weeks, others go even longer. "I gave Mila Kunis this look to break up and soften her dark natural color, and she sees me two times a year max," he says.

Naturally boost your blonde with Kloss-style babylights.

Williams' babylights bring a natural, sunkissed touch to her brunette strands.

Supersubtle babylights add just the right amount of dimension to dark hair.