Kim Kardashian, her mom, sisters, and a slew of gal pals tore up the town in Vegas last night to celebrate the reality star's upcoming marriage to Kris Humphries. They had a blast partying at Tao, but Kim couldn't resist the urge to check in on her man, who was having his own partay on the Strip.

Kim crashed Kris' party at about 2am, after a fun-filled night with her guests -- La La Vazquez, Brittny Gastineau, and her future sister-in-law, to name a few. The gals wore red illuminated rings

Kim Kardashian Crashes Fiance's Vegas Bachelor Party!