are alive with the sound of club music!
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