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Kim Kardashian Crashes Kris Humphries’ Las Vegas Bachelor Party

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So much for keeping things separate!

After celebrating her bachelorette party at Las Vegas' Tao Saturday, Kim Kardashian, 30, wandered next door to crash fiance Kris Humphries' own bachelor party at LAVO.

Related: PHOTOS: The Kardashians take Kris to Bora Bora

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.

Related: VIDEO: Kim pushes Kendall Jenner into modeling

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."

Related: PHOTOS: Inside Kim and Kris' whirlwind romance

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.

PHOTOS: See more pics of Kris' bachelor bash from PopSugar

"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!"

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