Lindsay Lohan caught on camera injecting heroin

The 24-year-old is photographed wrapping what looks like a tourniquet around her arm before using a syringe to inject herself with a substance into her left arm.The photographs, printed in the 'News Of The World', come just hours after Lohan was released from jail after just 14 hours behind bars following the posting of USD 300,000 bail.

"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," a source close to the actress told the newspaper.

The newspaper also published older photographs of the 'Mean Girls' star, taken at a Hollywood party in 2007, which shows her partying with socialite Paris Hilton, passionately kissing and cuddling her.

The actress was brought before a judge earlier this week after failing two drug tests, during her bail term for a 2004 drink driving case. One was for cocaine and the other was for Adderall, a prescription drug.

The former child star had earlier taken to Twitter to plead her case, saying that she is "a work in progress" and working hard to overcome drug abuse.

"I am taking responsibility for my actions. Regrettably, I did, in fact, fail my most recent drug test. Substance abuse is a disease which unfortunately doesn't go away overnight. I am working hard to overcome it and am taking positive steps forward every day," she wrote on her Twitter page.