Paris Hilton was assumed to be dating Alex Vaggo when she took him to dinner, then spent the night with him afterwards at a hotel. It looks like Alex was just paying his dues, since Paris got him a modeling job so he wouldn’t have to work as pizza boy anymore. It’s tough to make an honest living. Since Paris is still single, and on the hunt, but not finding many takers these days, she decided to STALK her ex boyfriend Stavros Niarchos. At Britney’s birthday get together the other night, Paris had been reported to be upset that she didn’t catch Stavros before he left. Page Six reports on Paris and her stalking behavior in Miami:

Hilton first ran into him [Stavros] 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."

The picture above shows Stavros (crap for brains) Niarchos making out all hot and heavy once Paris finally trapped him in a corner. Paris’ rep denies she punched anyone, but I really hope she did. I want to see the pictures, a nasty lawsuit, and Paris back in jail.