Credit: EBLV/Splash News Photo: Kim, Khloe, Kris, Lamar, and Mark Ballas Party in Vegas

When you're a Kardashian, the party never stops!

Kim Kardashian had a lot to be happy about this weekend as she partied first in New York City to ring in her 31st birthday — and also, maybe, to celebrate her recent casting in Tyler Perry's latest movie — but the jetsetting starlet continued the festivities in Las Vegas, where she hung out at Marquee on Saturday night. She was in good company, too, bringing along hubby Kris Humphries, sister Khloe and her husband Lamar Odom, and her close pal Mark Ballas of Dancing With the Stars

Despite recent rumors that Kris has been spending too much time with other women, the whole Kardashian krew appeared to be in good spirits, sipping Grey Goose cocktails and partying the night away. Looks like all is well in Kardashian land — for now. 

Here's wishing her a very happy birthday as she continues to celebrate in style!

Source: TMZ