Catfight: Paris and Lindsay

Paris Hilton is 25, but she can still behave like a bratty junior high school girl. On Saturday, Hilton turned up at the Lia Sophia jewelry clambake at the Polaroid Beach House in Malibu, where her nemesis Lindsay Lohan was holding court with new squeeze Harry Morton. "Paris was hanging out with Brandon Davis, her sister Nicky and Bijou Phillips," reports our spy. "She made it a point to whisper and laugh very loudly the entire time, snickering behind Lindsay's back." Lohan, who battled bullies in her movie "Mean Girls," retreated with Morton to a back bedroom where they couldn't hear Hilton's malevolent cackle. Later that afternoon, as Hilton strutted past Lohan's corner, one of Morton's friends jumped up and faked a kick to her bony backside when she wasn't looking. Hilton's snicker is nothing new to Lohan's ears - the heiress laughed herself silly during Davis' anti-Lohan "firecrotch" rant that was all over the Internet a few months ago.

Source: Page Six