They even released a statement after the Royal Wedding saying one of their make-up artists ‘provided make-up artistry assistance to members of the bridal party’.
The retailer also helps create her stunning, day-to-day complexion.
Kate apparently buys some of her make-up products, including Long-Wear Even Finish foundation, Sheer Colour Lip Gloss, and Creamy Matte Lip Colour, from the beauty brand.
For a light, daytime look when foundation may appear too heavy, she opts for Laura Mercier Oil Free Tinted Moisturiser, £33.
It is thought that she stocks up on her make-up products at Peter Jones’ department store off Sloane Square, where she is often spotted.
And she reportedly stopped by the Bobbi Brown counter on one of her visits, where a make-up artist gave her a step-by-step tutorial on how to create her perfectly defined eyebrows using a slanted make-up brush with dark brown eye shadow in a shade called Saddle.
Weekly manicures and pedicures keep her nails trim and tidy, courtesy of the Jo Hansford team, the experts Kate chose to create her white bridal nails for her wedding.
She tends to stick to neutral colours for her nails – often soft pink or subtle peach, and opts to have them rounded off in a square shape.
And she is said to keep her skin from looking pasty in the winter months by having a professional tan once a week.
As for her scent, the raven-haired beauty relies on Illuminum, the fragrance she chose for her big day.