Lindsay Not Clean In Rehab

October 3, 2007 8:19 a.m. EST

Utah (CNS) - Lindsay Lohan's planned release from rehab has reportedly been blocked after she failed a drugs test.

The "Mean Girls" star - who has been receiving treatment for drug and alcohol addiction at Utah's Cirque Lodge for two months - was said to have completed her program last week but it has been claimed she was forced to stay on after testing positive for cocaine.

Insiders also alleged she has been drinking alcohol and mixing diet pills with prescription anti-anxiety medication in a bid to get high.

A source told Australia's New Weekly magazine, "I think she'll take whatever pills they allow her. It's obvious to me she's high because she acts loopy and can't seem to walk in a straight line!"

Another insider said, "She had a friend sneak vodka in a water bottle into one of the Alcoholics Anonymous meetings she goes to. Everyone wants her to be their friend, so they'll do anything for her. She smells like booze, and the staff do nothing about it."

"I asked her if she had any intention of being sober and she looked at me like I was crazy. She's still doing whatever she wants."

Lindsay, 21, is due to serve the one-day jail sentence she received for her DUI (driving under the influence) conviction in May, and was scheduled to start shooting a movie in mid-October.

The actress' father Michael Lohan joined her at the facility yesterday for a five-day retreat in the Utah mountains to rebuild their relationship.