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Paris Hilton, Stavros Niarchos, Benji Madden

John Shearer/Getty Images, Soul Brother/Getty Images

Is there trouble in paradise for Paris Hilton and Benji Madden?

Since Paris and her ex-boyfriend Stavros Niarchos were spotted hanging out at Mokai in Miami, blogs have been buzzing about a possible hookup.

But according to a source, nothing questionable happened between the two former lovebirds. "They didn't come together or leave together," an eyewitness tells E! News. "They didn't make out at all!"

Paris, who another source described as "very wobbly" at Mokai, left the club to go back to her room and order pizza, while Stavros kept partying at Diddy's house, according to an eyewitness.

So what's up with her and Benji Madden?

When Paris departed for Miami on Friday morning with her girlfriends, she was sporting her "BM" ring.

But the Good Charlotte rocker, who was in NYC this weekend for TRL's final episode, may not have been too thrilled about the new snaps surfacing of his girlfriend and Stavros together.

On the first night both he and Paris were back in L.A., they went out separately. While Hilton hit Villa for some karaoke with sis Nicky last night, Benji hung at the Key Club.

Paris' rep didn't respond to requests for comment, while Benji's said, "We don't comment on our clients' personal lives." Stay tuned...