Reality TV star Kim Kardashian celebrated her 31st birthday at Marquee Nightclub inside The Cosmopolitan of Las Vegas Saturday -- and "Extra" was there!

The birthday girl was joined by husband Kris Humphries, sister Khloe and her husband Lamar Odom, mom Kris Jenner and Kim's former "Dancing with the Stars" partner, Mark Ballas.

Check out the pics!

As for those rumors Kim and Kris are having marital trouble, sister Khloe told "Extra's" Adrianna Costa no way. "They're together now and they're happy and we're having fun!"

What did Humphries give Kim for her birthday? "I got a nice necklace and a couple cards. We're really big on cards."

The voluptuous beauty said she's exactly where she wants to be at 31. "It's everything and more that I ever expected."

The one thing mom Kris Jenner wants is a grandchild. "I harass all my children about it. Everyone in my family should have babies because I'm done!"

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