Opt for auburn blonde highlights if you want to incorporate a deeper red-tinged color. Here, Beyoncé has hers in a subtle ombré with long, dark brown lengths.

“Highlights, in simple terms, are a technique to add dimension to monochromatic hair color,” says celebrity colorist and salon owner Christopher Naselli, who works with AGEbeautiful Hair Color.

Whether you’re looking to spice up brown strands or give brunette life a try for the first time, get hair-spiration from these 36 celebs who've embraced their dark side.

The star's dark brown-black tresses were gone, replaced with a warm, chocolatey light brown, and she looks so different. You know how we feel about a hair transformation here on Cosmo.

One of Kacey Musgraves' most signature physical features is her long, glossy, jet-black hair, which is reminiscent of Cher circa 1970. But this summer, the "High Horse" singer is switching up her ...