CROUCHING in a dark corner, Lindsay Lohan is poised to inject herself with what appears to be a syringe of heroin.
Our shocking picture shows the troubled Mean Girls star wrapping a tourniquet around her lower arm - the method addicts use to raise a vein.
Her right hand hovers the needle over the skin of her left arm.
In other exclusive images, apparently taken at a sleazy Hollywood bash, she snuggles up to party pal Paris Hilton before sharing a passionate kiss with her fellow wildchild.
Our horrifying revelations will compound fears about the extent of LiLo's breakdown - as she was returned to jail this week for a third time. Lohan, 24, was released yesterday following her 15 hours behind bars after posting £190,000 bail.
This was a result of her failing a court-ordered drugs test for cocaine, which was in breach of her probation stemming from a 2007 conviction for drink-driving and cocaine possession.
This is the first time there has been evidence that Lohan may have been dabbling in harder drugs like heroin, which is commonly injected.
Our source said: "These images of her with the syringe are terrifying."
In the startling new photos, the Hollywood hellraiser appears to play with the tip of the drugs needle - and then plays with heiress chum Paris.
The pair paw at each other before Paris straddles Lindsay and strokes her face. Lohan, revealing a bra strap and cleavage, then wraps her arms around the neck of Paris, now 29.
Speaking about the pictures, believed to have been taken in 2007, our source said: "What no one knows for certain is just how often Lindsay does drugs - or exactly which drugs she does.
"Lindsay has made no secret of her drug addiction. People are used to seeing her off her head."
Previously, the News of the World revealed shocking snaps of Lohan posing with US TV host Vanessa Minnillo - as she jokingly held a knife to her neck while LiLo bit the tip of another blade.
Lindsay recently Tweeted: "Substance abuse is a disease which doesn't go away overnight. I'm working hard to overcome it. I did fail my recent drug test. I'm prepared to face the consequences."
Her next court appearance is on October 22.
*mods I know you don't like things tagged with x17 on here but OMG