Giving your skin the royal treatment has just got a whole lot easier.

The late Princess Diana’s make-up artist Mary Greenwell has spoken for the first time about her former client’s skincare secrets and reveals how women today could learn a thing or two from her.

A-list make-up artist Mary Greenwell told Stylist: “Diana was very aware of her beauty regime, cleansing, toning and moisturising twice a day.

"Diana was very sensible when it came to her skin, she would always make sure she took her make-up off at the end of the day and make sure she always had a clean face before applying make-up. Not enough people do this and you should.

“Lots of sleep is also essential, as is exercise and a good diet. After I started working with her, Diana did everything in moderation. She cut back on drinking so her skin was 100%. Women today need to take care of themselves the same way. If you smoke, drink or do anything to excess, you will destroy your most important beauty asset – your skin. You must look after yourself.”

Describing her as “pure magic” with the “most incredible skin” – which Mary says comes down to genes as well as a looking after her complexion – Mary revealed how she also managed to put a stop to Diana wearing blue eyeliner and taught her apply mascara properly; by covering the roots of the lashes too.

“Diana was always very open and willing with her style,” she said. “I think as soon as we worked together she realised the power of hair and make-up and that is something that should never be underestimated. By anyone.”

As for Diana’s beauty routine, it was refreshingly simple.

“We always started with a moisturiser, a foundation to suit her skin tone exactly and then used a concealer to lift the eye area. Mascara – which is a gift of all gifts and a light blush and lip colour to suit her mood that day,” Mary added.