United Kingdom, June 27 -- Nigella Lawson is "allergic to the sun".

The 66-year-old chef - who will join The Great British Bake Off as a judge when it returns later this year - has insisted the secret to her glowing skin has nothing to do with Botox of fillers and instead can be attributed to a diet of high-fat food and staying out of the sun.

Speaking to The Mirror, she explained: "I'm a great believer in butter. I just eat what I want. I enjoy life but also, I know myself. I'm not punishing myself trying to look like a model. So that's good - I just waddle and enjoy myself.

"I think [good] skin is genetic, really. I'm also allergic to the sun so I don't go into the sun and that makes a difference. It's been [that way] my whole life b...