Kourtney Kardashian is celebrating her 38th birthday with her gal pals on the beaches of Tulum, Mexico, and if her sister Kim Kardashian's photos and live-tweets from the party are any indication, things are getting pretty crazy. Kim took to Twitter on Monday, where she shared a lot from their vacay, giving fans a "play by play" of the trip. And we mean, she shared a lot. "@kourtneykardash threw up in her bed 4 times and slept in it," Kim wrote in a lengthy series of tweets.