Heidi Montag & Spencer Pratt's 'Crazy' Night Out in Las Vegas
updated 10/21/2012 AT 02:00 PM EDT
•originally published 10/21/2012 AT 02:00 PM EDT
Heidi Montag and Spencer Pratt celebrated the three year anniversary of Crazy Horse III Gentlemen's Club in Las Vegas on Friday night.
Montag – who hosted the event – arrived wearing skin-tight black leather shorts and a see-through black top.
Joined by husband Pratt, the former Hills costars sat at a VIP table where they toasted with Dom Perignon Champagne and Patrón shots.
"Heidi came to the club with a mission – to get her first ever lap dance!" an onlooker tells PEOPLE. "Heidi selected two bombshell dancers and she showered them in $1 bills."
– Melody Chiu