The secret of Kate Middleton’s face-framing look is a modest £15.50 ($24) Bobbi Brown eye shadow powder from Peter Jones store make-up counter.

Duchess of Cambridge has learnt to use the product, from a range by make-up artist Bobbi Brown, to create the impression of thicker, darker, more luxuriant brows.

Kate Middleton, who has apparently long been concerned about her fair and slightly patchy eyebrows, is a frequent visitor to the Bobbi Brown counter at the Peter Jones store in London’s Sloane Square.

It is understood that staff taught her to apply a deep brown shadow in a shade called “saddle” with a slanted make-up brush to “fill-in” her “thinning” brows.

Kate Middleton is, by all accounts, delighted with her new look, feeling that the darker brows frame her face and make her eyes stand out.

But while Kate may have changed her look, it seems she has retained her down-to-earth approach.

The secret of Kate Middleton’s face-framing look is a modest £15.50 ($24) Bobbi Brown eye shadow powder from Peter Jones store make-up counter

Although she could simply summon the country’s top make-up artists to Kensington Palace, she picked up the eyebrow technique during a highly public – and free – make-up lesson on the shop floor.

Sitting on a stool at the bustling make-up counter, Kate Middleton listened intently while a beauty adviser gave her a step-by-step lesson. Other shoppers walked by oblivious as the pair chatted about everything from eye cream to facial corrector and a creamy concealer she has become a fan of.

Kate, 30, confided that she worries about lines and dark shadows making her look old.

To make sure she looks her best at high-profile events, she invested in a top secret “three set” anti-wrinkle set, which includes a £28 ($44) eye cream, a £17($27) facial corrector and a pot of concealer for £23 ($36).

And like most women, she couldn’t resist picking up a few extra goodies while she was there – a £15 ($24) lip liner pencil in “brownie pink” which she was told to apply all over her lips, rather than just on the edges, as a base for her lipstick.

She also bought a pinky £18 ($28) lipstick called “sandwash tulle” from the same range.

Kate Middleton’s cache came to £116.50 ($186.5).

An insider said: “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 events 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 recognized the Duchess as she sat there having her make-up lessons.

“Her bodyguards were very discreet and she looked just like any other young woman popping in to pick up a few free tips.”