Lauren Conrad is writing a tell-all about the behind-the-scenes act on the set of her her MTV hit The Hills as well as the antics of Hollywood’s young elite.

“A chapter got leaked to Kristin,” a friend of Lauren’s tells OK! Magazine. “It talks about her ‘sleeping around Laguna’ and stealing Stephen Colletti.”

Lauren, who is using a pseudonym to dish all, has even spilled some unflattering facts about Paris Hilton and Nicole Richie. A fact L.C denied to Paris’ face at a recent party.

“We all know she’s just trying to save face!” Paris’ friend tells OK!.

Lauren’s publicist says there is “no truth” to the book rumors.