The Kardashians Celebrate Kourtney’s Birthday With Cake and Booze (PHOTOS)

The process of childbirth is a wonderful thing on many levels—but perhaps the most wonderful thing about it is that mommy can finally walk away from that nine-month bout of sobriety and, if she so chooses, indulge in an adult libation or two.

Kourtney Kardahian, who gave birth to son Mason Dash Disick in December, turned 31 recently, and her sisters Khloe and Kim helped her celebrate in the best way possible—with a boozy jaunt to Sin City.

As Khloe explains on her official Web site,

“On Saturday we celebrated Kourt’s birthday in Vegas at Wet Republic and it was a craaaazy day!!! Before we flew to Vegas we went to Newport Beach to promote our Virgins, Saints & Angels collection, then immediately hopped on a plane. Kourt forced herself to part with baby Mason (that’s not always easy, she doesn’t go anywhere without him LOL) for the afternoon so we could have a girls’ day—it was me, Kourt, Kimmie, Malika, Lauren and Brittnysoooo much fun!”

Obviously so. Would you get a look at that cake, people? It’s propped up by liquor bottles. Can you think of a more sublime combination? And to think, the highlight of last year’s birthday party was when they drew all over their mother Kris Jenner’s face. Which is entertaining and all, but still…

Click through the photo gallery to see more pics of Kourtney K’s Vegas birthday bacchanal. And to keep up on all things Kardashian, make sure to visit Kardashianity.