Taken just weeks before she was admitted to rehab for the second time, the drugs-crazed 20-year-old wild child is captured holding a KNIFE to a friend's throat at a party.
The pal is also pictured sliding another blade down the Mean Girls star's breast... as Lindsay slips her own knife into her mouth in a chilling game.
Our frightening exclusive pictures were taken four months ago at a house party where Lindsay was publicly claiming she was reformed and sober after her first bout of rehab.
Now she is back in a Malibu clinic after driving her Mercedes into a tree, high on coke and booze. Last night a friend from Lindsay's inner circle revealed how the star's mental state has continued to crumble behind the walls of the Promises clinic in California.
"On the first night she couldn't stop crying. Since then she's refused to follow the rules and keeps having hissy fits about people," says our source.
Among the celebs she blasted were:
PARIS HILTON: "In one of her group meetings she yelled that her friend Paris was a coke whore and couldn't believe how stupid she'd been driving while banned. She said, ‘Paris thinks she's above everyone. She's not. Paris is a stupid cow and deserves what she gets'."
NICOLE RICHIE: Next she scathingly attacked actress Nicole. "She saw a woman who is bulimic and said, ‘She's like Nicole. What problems does Nicole have? The girl just needs to eat. Period'."
CALUM BEST: Our source said Lindsay was devastated after it was revealed her 25-year-old boyfriend had been caught enjoying a drug-fuelled romp with two hookers. Our source said: "Since then she has begun to self-destruct even more. When she was told what he had done with those prostitutes she broke down and cried, ‘I thought he loved me'.
"He still hasn't bothered to get in touch with her. She thought Calum might become her rock but sadly he has just continued his wild ways without her. That's torn her apart."
Lindsay's obsession with bedding famous men is also at the root of her drink and drugs-fuelled madness.
The friend revealed: "She cries all the time at what a mess her life has become and how she has behaved like a complete tart."
She bragged about the size of Jude's manhood before claiming she slept with him while he was dating Sienna Miller.
Her friend said: "She just got so carried away with bedding men like Jude and James Blunt she couldn't stop going out.
The friend added: "The clinic even took her mobile from her to make sure she can't call people who are a bad influence on her.