Demi to get a knee lift

She spent more than £200,000 remodelling her body in a move which rejuvenated her career and brought her romance with a handsome toyboy.

But despite her now enviable figure, Demi Moore has been visiting the plastic surgeon again.

The reason, say friends of the 41-year-old actress, is a growing unhappiness with her knees.

While every other part of her figure is toned to perfection, her knees are distinctly saggy.

And after her flaw was pointed out to her, the mother of three - who is very conscious that actor boyfriend Ashton Kutcher is 15 years younger than her - has 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

told an American magazine. 'He is a fantastic surgeon and his clients don't look like they've had surgery.

'Demi can't stand it that there is 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 are 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 British plastic surgeon Alex Karidis. '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 tell-tale sign that you have had surgery.'

If the actress does decide to have the surgery, it will add another £5,000 to the tally of improving her body.

Among the work she has allegedly had is liposuction to her hips, thighs and stomach, estimated to have cost £16,000, a £9,500 breast implant operation and £20,000 of work on her face.

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