Madonna's secret to a youthful look is reportedly staying in doors as much as she can to stop sun light touching her skin.

The superstar - who recently announced she and husband Guy Ritchie are to divorce – is known for her milky-white complexion and obsession with staving off the aging process.

And, according to a new report, the two go hand-in-hand.

A source tells the Daily Telegraph, "She refuses to allow sunlight – even through windows – to touch her skin and drapes herself in linen sheets and towels in order to escape the sun's damaging rays.

"Some nights she'll completely cover herself with thick moisturising creams.

"She'll go through pots and pots worth $1,000 (£500) a pop. And then she climbs into these protective plastic body suits.

"She sleeps covered in all this gunk and plastic.”

No wonder her marriage broke down...