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Psychic healer Simone Simmons says Di is warning Princess Kate she is “too skinny”.

She has advised her not to feel pressured into dieting and offered tips on how to cope with being part of “The Firm”.

Simone revealed Diana has also given her approval to her son Prince Harry, 29, going on to marry his girlfriend Cressida Bonas, 24.

The 57-year-old psychic, who is based in London, had a five-year friendship with Diana and heard some of her deepest secrets.

She says Di, who died in a Paris car smash in 1997, has been communicating with her during reg-ular “visits” and has been anxious to pass on messages to Kate.

Diana has given Prince William’s marriage to Kate “the thumbs-up” and is thrilled at the arrival of baby George in July, Simone says.

But after seeing the Duchess’s rapid post-baby weight loss, Diana, who once battled an eating disorder, sent a warning.

Simone said: “Diana’s been worried about Kate’s weight loss since she had the baby and wants her to start eating properly.

“She warned that Kate’s too skinny. And she’s told her: ‘A little bit of what you fancy does you good.’

“She is concerned Kate should not feel pressured by other people and is happy in her own skin.

“Diana is delighted with the arrival of George too. She would have been a brilliant grandmother, very protective.”

Simone has told how during one recent appearance in her flat, ghostly Diana was dressed in a peacock blue, shimmery dress with flat, metallic, greeny-blue sandals.

She claims Di told her Kate, 31, has not always behaved in the right way, such as going topless on holiday in France last year.

And she warned Kate to be wary of fashion designers.

Simone said: “Diana would like to tell her about clothes and not to fall for what other people say about what you wear.

“Kate will get lots of dresses and shoes free.

“Diana would tell her: ‘They are using you like they used me.’”