The blonde socialite, who suffered a similar ignominy in 2004 when private text messages on her mobile phone were leaked onto the internet, insists the accusations are "silly".

Lohan's spokeswoman Leslie Sloane Zelnik tells PageSix.com the perpetrator sent "disgusting and very mean messages that everyone thought were coming from Lindsay. They weren't. We now have her lawyers looking into it.

"Some people think Paris may have been involved because the wording of the messages sounds very familiar."

Hilton's representative Elliot Mintz retorts, "I'm saddened this happened to Lindsay. I lived through this with Paris two years ago when her Sidekick was hacked into, and the loss of privacy is unbearable.

"But as for any suggestion that Paris would have anything to do with this, that is silly, untrue and unfortunate."

Meanwhile, People reports, just two days after making nice at a Prada party, Paris Hilton had her claws out for Lindsay Lohan at a clambake hosted by jewelry line Lia Sophia at the Polaroid Beach House in Malibu.

The hotel heiress was dancing with pal Caroline D'Amore in the living room when Lohan showed up with beau Harry Morton. Immediately, Hilton began staring her down, making fun of her and snickering in her direction with her crew – including sister Nicky, Brandon Davis and Kevin Connolly. "It was so tense and awkward," says a source. "It felt like round two to the whole Brandon and Paris bashing Lindsay on that video. So high school."