There’s a lot of work behind that flawless blonde look. Picture: Bryan Bedder/Getty

For two decades now we’ve barely seen a peroxided hair out of place from the stunning singer. Now, Gwen’s own personal hairstylist, Danilo, has revealed exactly how much work goes into creating and maintaining that perfect look, each and every day.

Stefani circa 2016: Not a dark root or a hair out of place.Source:Sunday Style

“The truth is Gwen’s hair has a career too. It has to entertain, it has to perform,” he tells E! News in a new interview, divulging just how much attention is paid to her famous locks.

“When I was coming up, I remember I was told that Marilyn [Monroe] would have her hairstylist come touch up her roots every 10 days … with a Q-tip. And I remember thinking, ‘Wow that’s a lot!’” Danilo laughed.

But as it turns out, Danilo’s routine with Stefani is even more stringent: touch-ups every seven to eight days.

In 2001.Source:AFP

“I know roots are in right now … but I don’t like them on her. I want her to look seamless,” he said.

And for those wondering how Stefani, a natural brunette, keeps her hair healthy and nourished despite constant bleaching, Danilo’s about to let you in on a little secret.

“We haven’t used bleach since 2004. I developed a high-lift formula that achieves the same effect but saves the quality of her hair. I did a lot of research and really looked at places of origins for blonde hair colour like Germany and Scandinavia. I’ve spent years finding and testing new lines and technology.”

Danilo says he colours, washes and treats Stefani’s hair once a week, leaving her to sit with a pack of deep conditioner for around 45 minutes.

Way back in 1996 with her No Doubt band mates.Source:News Corp Australia

But his real secret weapon? The reason his famous client has been able to maintain shimmering platinum blonde hair for so many years without damaging the strands?

Danilo styles with conditioner. Yep, very flawless hairstyle you see Stefani rock has been created using “layers of conditioner”.

“She gets multiple types of deep conditioning every day,” he reveals, which cancels out the damage to Stefani’s hair caused by the constant colouring.

Now we just need someone else from Stefani’s inner circle to explain why she looks younger today than she did in 1996 ...