In true celebratory form, the Kardashian sisters took to Wet Republic Pool at MGM Grand Resort Casino in Las Vegas on Saturday. Having flown in from the Wayne Airport in Orange County after morning press duties, Kim, Kourtney and Khloe joined together to throw a belated birthday bash for Kourtney (who turned 31 on April 18).
Also joining in on the poolside festivities, which included deejayed entertainment, drinks and a Bombay birthday cake, were Lauren London, Brittny Gastineau and Malika Haqq. Tweeting about the trip to Sin City, Kourtney excitedly wrote, "Just landed in vegas baby...with khloekardashian kimkardashian mslaurenlondon brittgastineau and malika! Nothin like a girl trip!"