Shocking pictures show Lindsay Lohan with syringe of heroin, snogging Paris Hilton

A shocking image showing Lindsay Lohan on the verge of injecting herself with what appears to be a syringe of heroin has emerged.

In the picture, the troubled Mean Girls star can be seen 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 in 2007, she snuggles up to party pal Paris Hilton before sharing a passionate kiss with her fellow wild child.

This is the first time there has been evidence that Lohan may have been dabbling in harder drugs like heroin, which is commonly injected.

"These images of her with the syringe are terrifying," News of the World quoted a source as saying.