"Now she's finally kicked him out, she's come to her senses and realised her life is a mess. It's like she's woken up after a nightmare. So she's on a campaign to sort herself out and get healthy — and everyone is clubbing together to make sure it succeeds."

One impeccably placed source told the Mail that the change wrought in Kate by the break-up had been "startling".

"She's drinking two litres of water a day, having lots of facials and beauty treatments, cutting back massively on the booze and doing her best to get to bed early," says the source.

"That's unheard of for Kate. She always did whatever she wanted, whenever she wanted and still looked amazing. But something fundamental has changed."

Indeed, whisper it quietly but the queen of effortless rock'n'roll chic has even broken the habit of a lifetime and started. . .working out.

An old friend of Kate's, with impeccable rock'n'roll credentials of his own, told the Mail this week: "You wouldn't recognise her — she's even been going to the gym, which you'd never have caught her doing before.

"The last few weeks have been hard for her. Breaking up with Pete hit her so hard. But every time I see her now, she's a little bit better, a little bit brighter in the eyes. She's getting back on form again and it's great to see."

The strategy — described by some friends co-opted to help out as Operation Phoenix — hinges on a complete break from the past.

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