The troubled star--who claims to have sobered up after her recent stint at the Los Angeles Wonderland Center--is also reported to have bragged to friends about her sexual exploits with actors Jude Law and Spider-Man star James Franco as she partied at trendy Hollywood nightclub Teddy's.
A friend tells British newspaper the News of the World: "That night I saw her do more than 20 big lines of cocaine. She was still up doing drugs at 11 a.m. She was blatantly doing it off tabletops, keys, books and in the wardrobe... In an average night Lindsay will do two and a half grams of coke on her own.
And the source claims the Mean Girls star only checked into the Hollywood treatment center as a publicity stunt.
She adds, "Going to rehab was all for publicity. She wanted people to see her seeking help but it hasn't got her off the drugs at all."
COPYRIGHT 2007 WORLD ENTERTAINMENT NEWS NETWORK LTD. All Global Rights Reserved.