Paris and Nicky Hilton party hard at the Sundance Festival

They’re young, they’re single…I suppose the Hilton sisters can party hard if they want to! But if I was Nicky Hilton, I didn’t think I’d want my boyfriend flashing and taking photos of his private parts in public! Eeeekkkk

Daily Telegraph reports

THE Hilton sisters have been turning up the heat at the Sundance Film Festival with more debauchery and other party antics.

The New York Post reports today that Nicky Hilton and her boyfriend, David Katzenberg hit Club Stereo, which took over Doolin’s bar on Main Street, for the Anamigo party.

Katzenberg reportedly stood in a corner at the club, where he pulled down his belted jeans and started taking pictures of his private parts bulging through his grey boxer briefs while Nicky “giggled” next to him.

Meanwhile, her sister Paris was photographed last night at Hyde Lounge in Park City, Utah, making out with actor Jared Leto.