Nigella Lawson has stunned fans with her age-defying looks, appearing decades younger on the 12th season of My Kitchen Rules (MKR).

The 62-year-old delighted fans with her appearance as a judge on the popular cooking show, with many viewers wanting to know the secret to Lawson’s seemingly ageless visage.

One fan jokingly attributed the British cooking queen’s ageless appearance to some kind of witchcraft.

As reported by Oprah.com, Lawson said the secret to ageing gracefully is to do what you love.

“I think what ages a face most is disappointment and a lack of enjoyment. So I try to do what I love,” she said.

“When you feel completely alive in your body, you feel good and you’re more beautiful.”

Lawson replaced MKR’s Pete Evans as Manu Feildel’s judging partner after the controversial judge shared a series of conspiracy theories on social media.

After a two-year hiatus and declining ratings, Lawson has been dubbed the “vital ingredient” to “save the show”.

It’s rumoured that the stunning celebrity cook will only be appearing in the first half of the show, with former MasterChef judge Matt Preston replacing her for the remainder of the season.