The eccentric singer has reportedly instructed her assistants to throw away all of her old bras and pants as she believes the feel of the more expensive fabric on her skin helps boost her creativity.

A source said: 'She's so in love with the way it feels on her body, she's demanded every piece of lingerie be made from 100 per cent pure silk.

'Polyester, cotton and Lycra are all banned. The finest silk, made to order, is all she'll wear now.

'She really believes this will help her creativity because if she feels comfortable and her skin is able to breathe properly, she'll be able to concentrate on her music.'

The 'Paparazzi' hitmaker has spent an estimated £7,000 in replacing all her old underwear with silk garments but doesn't mind about the cost.

The source added to Now magazine: 'She's taking this latest fetish seriously and driving her assistant crazy.

'Some garments go for £70 a pair and because she's kitted out the entire underwear section of her wardrobe, it's cost her close to £7,000.

'She's successful enough to demand anything she wants, even if it's silky pants.'