Kate Middleton has always been proud of the fact that she does her own makeup, even on her wedding day, when eyes all over the world would be scrutinising her.
In the last few months there has been an increased interest in her eyebrows, with plenty of people suggesting she's adopted the 'Scousebrow' trend made popular by Coleen Rooney and the cast of Desperate Scousewives.
We've been wondering what it exactly is she's been doing differently - tinted or tattooed - and now we finally have the secret to her perfectly groomed brows.
A £15.50 eyeshadow powder from make-up brand Bobbi Brown.
The Duchess has learnt to use the product to create the impression of thicker, darker, more luxuriant brows.
It seems that Kate has become quite the regular at the Bobbi Brown counter at the Peter Jones Store in London's Sloane Square.
According to the Daily Mail the staff taught her to apply a deep brown shadow with a slanted make-up brush to fill-in her thinning brows.
An insider told the Daily Mail: "In her position she has to look good and can't be seen at posh events touching up her make-up.
"She said she has a lot of eents coming up and wanted to look her best during a big tour of the South Pacific she has later this year.
"What was most remarkable, though, was that none of the other shoppers recognised the Duchess as she sat there having her make-up lessons.
"Her bodygaurds were very discreet and she just looked like any other young woman popping in to pick up a few free tips."
Kate, 30, also confided that she worries about lines and dark shadows making her old. She has apparently invested in a top secret three-step anti-wrinkle set, which includes a £28 eye cream, a £17 facial corrector and a pot of concealer for £23.
Femalefirst Taryn Davies