PARIS BACK ON STAVROS' TRAIL

Paris Hilton desperately wants her ex, Stavros Niarchos, back, say sources who have followed her antics in Miami this week.

The former lovers, who are in South Beach for the annual Art Basel festivities, provided a traveling sideshow as Hilton spent the week trailing Niarchos from spot to spot trying to get his attention.

Hilton first ran into him at Mansion Wednesday night, where he was paid to host the official Art Basel kickoff party. When the Greek shipping heir showed up with Brandon Davis' ex-girlfriend, Caroline Vreeland, however, Hilton was not pleased.

"Paris beelined for Stavros, but he was chatting up Caroline," said our source. "He was completely ignoring Paris, and she was furious. She shot them evil looks and finally stormed up to them and started screaming at Caroline."

On Thursday, the celebutard followed Niarchos to three different clubs. One partygoer at Mokai, where the rich kids started their night, told us, "Paris saw that Stavros was with a girl, and she went crazy. She literally stood on Stavros' table and began screaming at him. Then she started dancing and trying to get his attention."

The insider said that when Stavros and his date left Mokai and moved on to Set, Hilton followed: "Paris went to great lengths trying to get Stavros' date kicked out, begging club security to get rid of the girl." Our witness even claimed, "Paris was so furious, she ended up walking up to the girl and just punched her."

But a rep for Hilton called that account baloney: "Paris was at both clubs but at no time physically struck anyone. These accusations are completely false."

Meanwhile, the art fair is in full swing and Miami is in gridlock. "The city was unprepared," a limo driver said. "Everyone brought an entourage with them this year and the traffic is impossible. It takes forever to get from one end of town to another."

Every hotel on South Beach held a party Thursday night. The Ultimate Fighting Championship debuted its "Octagon" book (which sells for $2,500) at the Setai with Mandy Moore. Agent Provocateur held a party at the Florida Room in the Delano where models in lingerie ate fire and twisted themselves into precarious positions.

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