My 2nd favorite Kardashian turned 31 last weekend, and what better way to celebrate than to hit up a Vegas pool party? Kourtney Kardashian and her 2 sisters made a splash at Wet Reublic, another one of the trendy pool parties, this one being at the MGM Hotel. The birthday party was sponsored of course by Wet Republic but also by Bombay Sapphire. Gin? Yuck but hey, at least the cake looks cool!

At Wet Republic they walked the red carpet, Kim in a black Proenza Schouler jumper, L’Wren jewels and Robert Rodriguez heels and Kourtney flashing a bikini under a cover up. See, I told you rompers would be all the fuss this Spring & Summer To shop an almost identical black romper as the one Kim wears here, visit www.bebe.com.

Here are some pics of the sisters at the event! Anyone else think Kim’s lips are part of the ever changing face she’s been showing off lately? Maybe they’re just lined but they look a little plumper to me ;P

[View with PicLens]