The hotel heiress reportedly followed the 'Fight Club' star from party to party in Utah's Park City at the weekend and couldn't keep her hands off him.
A source told the New York Post newspaper, "Paris kept bothering Jared during the Camp Freddy concert at Village at the Yard. Then she attacked him at Hyde nightclub, giving him lap dances and kissing him."
Meanwhile, the 26-year-old socialite's little sister Nicky and her boyfriend David Katzenberg have also been causing trouble at the festival.
The couple indulged in a little lap dancing and took intimate photographs of themselves at Club Stereo at Doolin's Bar on Main Street on Friday night.
An onlooker said, "David stood in a corner at the club pulling down his belted jeans and taking pictures of his private parts bulging through his gray boxer briefs, while Nicky giggled next to him."