“We colour her hair every Monday, before we film The Voice," he told the publication.
"Gwen’s an Italian girl with wavy brown hair — if you look at the video for Cool, we did her in her natural shade, maybe a little darker — so I developed a high lift formula for her. I learned that I could get to a place of achieving the blond that I want, and the quality of hair that we need and want, by using a new product, as opposed to just bleach. People are like 'that's not natural' and I say, ‘Of course it is — it'ssupernatural’."
We guess that explains how Gwen has perfect roots 365 days a year.
Keep in mind, the woman has rocked this colour since 1990. That's a whopping 27 years of maintenance!
As for keeping her mane slick, the hairstylist revealed he's a big fan of leave-in conditioner.
“Leave-in conditioners — that's really the secret," he said. "So many people are blow drying and using hot tools, which is where most of the damage happens — so I'm always telling people to learn how to work with leave-in conditioning at every stage of styling."
This article originally appeared on InStyle Australia