Paris Hilton -- Getting Orgasmic In Vegas

Paris Hilton showed surprising emotion in Vegas when she fake orgasmed in front of hundreds of people.

There was moaning, but no complaining, when Paris hit the stage at the "Thunder From Down Under" show during the bachelorette party of her cousin, Brooke Wiederhorn.

The boys onstage called the girls up to show their stuff in the orgasm department, and Paris won hands down.

The Hilton led group also made stops at Beacher’s Madhouse in the MGM and Britney Spears’ “Piece of Me” to show her what she'll be missing once she ties the knot.

But seriously, her orgasm was really good.