In the world of young Greek billionaires, Paris Hilton, 24, has traded up. Hilton — who ditched her fiancé Paris Latsis, 23, a month ago but only formally announced it last week — has been romancing Mary-Kate Olsen's boyfriend, Stavros Niarchos, 20, whose princely family makes the Latsis clan, worth $7.5 billion according to Forbes, seem nouveau riche.

On Friday, the new duo showed up at Spider Club in L.A. and "made out all night and closed the place down," a spy said.

The next night, the couple was at Element with Paris' sister Nicky. Paris "tried to get the club to turn the lights down so no one could see her and Stavros make out," another spywitness recalled. "She also got the club to clear out the bathrooms for her and her friends so that no 'fans' would be in there with her."

Insiders predict Hilton's latest pairing — the party girl was also spotted cozying up to her music producer, Scott Storch, last month — won't last because the reserved Niarchos clan is so publicity-shy they didn't like Stavros dating Olsen. "They haven't seen anything yet," snickered a source.

The Stavros conquest is also threatening Hiltie's friendship with Olsen and her sister Ashley because Mary-Kate is said to feel betrayed. In fact, a lot of Hilton's famous friends seem to be flocking elsewhere. "One Tree Hill" star Sophia Bush, Jessica Simpson, Hilary Duff, Lindsay Lohan, Nicole Richie and other young Hollywood hotties have all stopped hanging out with Hilton for various reasons.

However, Paris can console herself with her jewelry. It's rumored that the hotel heiress intends to keep the $5 million, 24-carat diamond ring Latsis gave her.

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