Yet despite her enviable figure, Demi Moore, 43, always had one or two things she wanted to hide away - namely her knees.

Now after finding a surgeon who has perfected a technique to remove saggy skin from the notoriously difficult-to-correct area, Miss Moore is once again a perfect 10.

After her flaw was pointed out to her, the mother of three - who is very conscious that actor husband Ashton Kutcher is 15 years younger than her - asked her plastic surgeon to see what he can do.

"Demi went to Brian Novack, who has already done work on her," a source close to the actress said. "He is a fantastic surgeon and his clients don't look like they've had surgery. Demi couldn't stand it that there was any part of her that is not perfect.

"She is also sensitive about her age, although Ashton has told her a million times he doesn't care about what she looks like because he loves her.

"A lot of her friends were trying to talk her out of having more surgery. Worrying about her knees, of all things, is just silly. She's lucky that's the only part of her left to sag!"

Knees are one of the hardest areas of the body to have done because there is nowhere to conceal the scarring.

"If you cut away skin there is going to be scarring," said plastic surgeon Alex Karidis of the Hospital of St John and St Elizabeth in North London. "If you have a neck lift you can hide the scarring behind the ear, but the knees are one of the most exposed areas of the body.

"I would always advise my clients against having knee surgery because it is impossible to hide. And even though the scarring might not be as bad as the sagging, it will be a telltale sign that you have had surgery."

The surgery added another ¡ê5,000 to the ¡ê220,000 tally of improving her body. Among the work she has allegedly had is liposuction to her hips, thighs and stomach, estimated to have cost ¡ê16,000, a ¡ê9,500 breast implant operation and ¡ê20,000 of work on her face.

She has also paid an army of advisers including a nutritionist, personal trainer, yoga teacher and kick-boxing coach.

After a string of film flops in the late Nineties and a difficult break up with her husband of 11 years, Bruce Willis, Miss Moore has enjoyed a comeback since having the main work done nearly four years ago.

What cosmetic surgeons believe Demi has had done:

* Liposuction to her hips, inner and outer thighs and stomach - ¡ê16,000
* Beast implants for 1996 film Striptease - ¡ê11,000
* Subsequent operation to reduce her breast implants and have a breast lift - ¡ê9,500
* Brow lift - ¡ê3,600
* Chemical facial skin peel - ¡ê10,000
* Collagen injections (per course) - ¡ê200
* Teeth veneered and laser whitening - ¡ê6,200
* A long-term diet and fitness routine, including nutritionist, personal trainer, yoga instructor and kick-boxing champion - ¡ê165,000
* Knees surgery - ¡ê5,000

Total: ¡ê226,500