Khloe Kardashian doesn't turn 27 for another 10 days, but that didn't stop the reality star from stealing away with her hubby and fam for some "pre-bday" partying. Khloe, Kim, and their significant others celebrated last night in Las Vegas in honor of her upcoming big day.

Kim and her hubby-to-be Kris Humphries got dressed up and joined Khloe and Lamar Odom and friends at Chateau nightclub last night. They hung out in the VIP section (duh) where the expensive champagne was flowing and everyone smiled and sat around, watching the crowds dance below in the non-VIP area.

Kim and co. did mingle with some non-stars, however -- she even posed with two sheriffs in uniform at the swanky club!

Khloe tweeted last night: "I love having a pre-bday party!!!!! 10 more days until I'm really an old lady...."

Kim also chimed in: "What's up Vegas!!!! We are celebrating @KhloeKardashian's bday! Sugar Factory is delish!"

The couples had what looked to be an epic evening, and the parties are just getting started...