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Lindsay Lohan's jealously over ex-girlfriend Samantha Ronson drove the starlet back into drugs, according to Kikster.

The site claims Ronson's recent trip to Cabo San Lucas to hang with Nicole Richie for her secret bachelorette party sent Lilo into a fit of rage.

A source at the event tells the site:

    "It was really annoying Nicole that Lindsay kept trying to track down Sam during her bachelorette party. Both Nicole and Christina Aguilera told Sam to stay away from Lindsay. They told her forget about Lindsay and her drama and just have a nice weekend."


Samantha, whom the source claims has an "unhealthy power" over lindsay, didn't return any of Lindsay's calls and that "made her nuts. This is what pushed Lindsay over the edge and back into drugs," adds the source.