A celebrity habit...

Love addiction may be a new celebrity phenomenon but sex addiction has become old hat.

In 1992, Michael Douglas checked into the Sierra Tucson Clinic in Arizona to treat his over-active libido at the insistence of his first wife, who was tired of his constant womanising.

It may not have worked, as she filed for divorce three years later.

The addiction has since become as well known among stars as booze and drugs.

Rob Lowe, Warren Beatty, Billy Bob Thornton and Halle Berry's husband Eric Benet are all said to have had therapy to control their sexual appetites.

And it's not just the men who are at it.

'It girl' Tara Palmer Tompkinson is also believed to have paid for treatment.