Lindsay Lohan has been caught on camera about to inject herself with what appears to be heroin.
The troubled actress - who was sentenced to four weeks in jail on Friday for violating her probation by failing two drug tests, but was released hours later - is photographed wrapping what
looks like a tourniquet around her arm to raise a vein before hovering a syringe over her left arm.
The images - which have been obtained by website X17online and the News of the World newspaper - were allegedly taken at a sleazy Hollywood party in 2007 and friends of Lindsay have been concerned about her lifestyle for many years.
A source said: "These images of her with the syringe are terrifying.
"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."
The photographs also show an unidentified person injecting a syringe into Lindsay's lower back while another one shows Lindsay enjoying a passionate kiss with Paris Hilton.
Meanwhile, friends of Lindsay, 24, claim she will enter rehab voluntarily within in the next few days, following her release from prison.
One told People magazine: "She will step up her treatment and do more than what she was previously ordered to do."
As part of the conditions of her release, Lindsay must wear a SCRAM alcohol-monitoring bracelet and avoid places "where alcohol is the chief item of sale".
The Mean Girls star served only 13 days of a 90-day jail term in July for violating the probation terms of a 2007 conviction for driving under influence (DUI) and just 22 days of a 90-day court-ordered rehab stint following her release from prison in August.
-BANG! Showbiz
