"The Simple Life" star partied at the Body English nightclub located in Las Vegas' Hard Rock Hotel and Casino with on-off love Stavros Niarchos, sister Nicky Hilton and best friend Nicole Richie.
A source told the New York Post newspaper: "There were midgets leading a pack of goats around the room and Paris was playing with a monkey."
"Paris spent a lot of time making out with Stavros and dancing. They downed TY KU liquor and bottles of Dom Perignon."
The party then moved on to the bowling alley where Paris and her friends tried to score a few strikes.
Review of Hilton's birthday party 
