Lamar Odom to expose Khloe Kardashian sex tape?

Lamar Odom is reportedly planning to expose a sex tape featuring Khloe Kardashian.

The disgraced basketball player's marriage to the TV personality has been on the rocks since allegations of infidelity and drug abuse surfaced earlier this year, and it has been alleged that Kris Jenner has made Khloe thrash out details of their divorce with the family's attorney.

However, Lamar has made a series of his own demands and wants a $10 million settlement and the return of the $875,000 engagement ring he gave to Khloe - who he wed in 2009 - otherwise he will leak the tape and other damaging revelations about the Kardashian clan.

A source told National Enquirer magazine: "Lamar is prepared to destroy Khloe's reputation by discussing their sex tape, and how she targeted him and tore his family apart.

"Kris is insisting on a confidentiality agreement to ensure Lamar can never discuss his life with the Kardashians either in print or verbally.

"He's not signing anything until they cough up the dough."

According to the publication, Kris is worried about the leverage he has since he doesn't have much to "lose" if he does reveal personal details about the famous family as his sports career is virtually over and his reputation is in tatters.

The source said: "Kris and Khloe are very worried about Lamar. He's a loose cannon, and he has a lot of dirt on the family and nothing to lose.

"He knows all about their extreme surgery procedures - when, how often and how much - and the pressure put on the younger girls to follow suit."