"Rehab was her last chance to straighten up," says an insider. "Now she's gone and blown it off, after using the place as an expensive hotel for a few weeks and not doing a thing about her drink and drug habit."

Since checking in to the Wonderland rehab center on January 17, the actress has barely spent a full day there. Instead of staying on the premises to get treatment, Lindsay dropped in and out, leaving to shop and dine at trendy LA restaurants - and returning to her party-hard ways.

Over the weekend, Lindsay Lohan hit the Hollywood bar scene over the weekend.

Lohan partied with pal, Paris Hilton reports TMZ.

The tabloid twosome created a paparazzi firestorm Friday night as they laughed and joked on their way out of Les Deux nightclub. Then, less than 24 hours later, TMZ cameras caught Lohan sneaking out of Area nightclub.