Stavros Niarchos still banging Paris Hilton?

After the breakup, Stavros Niarchos visited Paris Hilton's house and later went on a screaming and yelling rant.

The celebutante dumped her boyfriend of eight months, Stavros Niarchos III May 2nd. Hilton's rep, Elliot Mintz told People magazine, "It is not my policy to comment on my client's private life. But I would not offer a denial."

Sources claim that the parties Paris threw last month for Stavros’s 21st birthday were the final straw. “They really made her realize she wanted to move on," an insider told Star magazine. It may seem surprising that the parties changed Paris’s mind, since witnesses claim the couple was very affectionate at Hilton’s LA bash for Niarchos. But, in the end, it was Stavros’s immaturity - he’s four years younger than her - and self-centeredness that really got to Paris.

Photographers who were camped outside Paris's house tell TMZ at Stavros arrived around 1a.m. and spent an hour crying and ringing her door bell, begging to be let in. At one point, Stavros was spotted sprawled out on her driveway.

Around 2 am Paris finally let him in and the screaming continued. We are told they were so loud the fight could be heard outside the house. Stavros was heard hollering "Take me back!" and "I give you everything!!" Sources say during the fight Matt Leinart's name was brought up a few times.

We are also told Paris was overheard trying to calm down the rich Greek by saying "Take it easy" and "Go home and get some sleep."

During the night, a cab came and went three times, but each time left without the shipping heir. Finally, around 8 in the morning, Stavros got in a cab and headed out.