Princess Beatrice and Princess Eugenie have one good friend that is also adored by their cousin Prince Harry.

Celebrity nutritionist Gabriela Peacock, who is considered to be the “secret weapon” of the young royals when it comes to keeping them in shape, has been a good friend of Princess Beatrice, 36, for years.

Through their friendship, Gabriela has been in contact with other royals and helped a number of them prepare for their weddings, including Beatrice’s sister Princess Eugenie, 34.

However, not everyone knows that Harry also seeked advice from the celebrity nutritionist just before his 2018 wedding to wife Meghan Markle, 43.

This was a result of the prince wanting to be his healthiest for the big day, which saw him cut back on processed foods and make healthier lifestyle choices.

Since being in touch with Gabriela before his big day, Hello! reported that Harry has become a fan and regular user of Gabriela’s "Cleanse Blend" supplements.

These reportedly use "the finest essential minerals, vitamins and superfoods to nourish from within and support greater wellness."

According to GP Nutrition, the 'Cleanse Blend' supplements are a "potent combination of nourishing and green superfoods curated to support the liver with its complex processes."

They can be taken daily or in short doses "to support liver detoxification" after a holiday or alcohol-heavy celebration.

It is also rumoured that Meghan has been following in her husband’s footsteps and has also received advice from the nutritionist since being involved with Harry.

Gabriela has not publicly spoken about royal clients but has previously given insights into her friendship with Beatrice, saying she sees the princess “all the time” which is "super nice".

The nutritionist is also the godmother of Beatrice’s daughter Sienna, showing just what a close friendship the pair really have.