It looks like Paris Hilton is over Stavros Niarchos -- at least this week. The celebutante was seen hanging with Desperate Housewives' star Josh Henderson on St. Patrick's Day -- Stavros was "no where in sight," Star reports.

The possible couple met up at a club on Saturday night, and then went to Paris' for a St. Patty's Day bash. But before the entered the party, Paris and Josh flirted for 15 minutes alone in the backseat of a friend's Hummer!

But even after Paris and Josh joined Nicole Richie, Brandon Davis, and other members of Paris' crew in the house, the cozy twosome seemed to want a party for two. "They couldn't take their eyes off of each other," the source says. "Paris looked completely smitten with Josh. She just kept smiling and laughing at everything he said, like she was under his spell. They actually make a really good looking couple."

We're green with envy -- Josh is a hottie!