Paris Hilton moves to dlist!

Simple Life beauty, Paris Hilton celebrated her 26th birthday in Las Vegas over the weekend with Stavros Niarchos and Brandon Davis.

Her sister Nicky, Nicky's boyfriend David Katzenberg and Nicole Richie and Joel Madden celebrated with Hilton at the sushi restaurant Nobu .

According to gossip columnist Janet Charlton, Hilton was seen hopping between Niarchos and Davis, alternately kissing one, and then the other, between bites of sushi.

The threesome also reportedly shared a room at The Palms Hotel and Casino reports Sfgate.

Meanwhile, Page Six is reporting that Hollywood A-listers shunned Paris Hilton's 26th birthday in Las Vegas in favor of hanging out in New York for Untitled Entertainment founder Jason Weinberg's 40th birthday at Midtown hot spot The Grand on Friday night. The power player toasted his big day with close friends Clive Davis, Kanye West, Marissa Tomei, Amy Sacco and Naomi Watts.

"There were no names there except for [sister] Nicky Hilton and Nicole Richie," said Page Six's source.