So much for keeping things separate!
Though they had promised not to see each other, Humphries, 26, proudly kissed his bride-to-be in front of the entire nightclub. Kim and her friends mingled with Humphries' guests, which included Rob Kardashian, Jonathan Cheban, Scott Disick and Lamar Odom.
As cameras documented both parties for an upcoming episode of Keeping Up With the Kardashians, "Kourtney tried to give Scott a penis straw and he rejected it," an onlooker tells Us Weekly. Both groups then danced to Jagged Edge's "Let's Get Married" and "Return of the Mack."
Earlier in the night, Khloe, 27, made good on her promise to embarrass Kim at her bachelorette party. Wearing an illuminated tiara and a sash, Kim was joined by 20 guests, including sisters Khloe and Kourtney, mom Kris Jenner, and pals LaLa Vasquez, Simone Harouche and Brittny Gastineau.
"My sisters are doing everything they can to embarrass me," the E! reality star told the crowd. Surrounded by traditional bachelorette accessories (straws and cakes shaped like penises), Kim laughed when a miniature male stripper jumped on the table to perform a striptease.
"Amazing night!" Kim tweeted afterward. "DJ Vice killed it!"