Lindsay Lohan holds KNIFE to a friend's throat

News of the World UK has posted shocking sick images of Lindsay Lohan.

The shocking sick images taken just weeks before she was admitted to rehab for the second time, shows drugs-crazed 20-year-old wild child 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..

A source told NOTW: "These photos are very worrying. Lindsay is so out of control. She should not be left within a million miles of a knife. The states Lindsay gets herself into she is lucky to be alive."

The images were taken 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.