Sister-in-law reveals Houston's sex secrets

Troubled singer Whitney Houston's alleged crack addiction has turned her into a sex-hungry fiend, according to her sister-in-law, Tina Brown.

As part of a two-week world exclusive, Brown, the sister of Houston's husband Bobby Brown, has revealed the full extent of the singer's drug problems to The National Enquirer tabloid.

After telling all about Houston's secret life last week, Brown is now revealing how her sister-in-law's alleged drug habit has made the I Will Always Love You singer sex-mad.

Brown tells the Enquirer: "Whitney has a problem. She's got to have it.

“Bobby always tells me: 'If you only knew. She's with this one and with that one. It's no secret.'

"I've seen her with a woman a couple of times. They were walking around without their shirts on when I came in the house."