By Jailene Cuevas Kourtney Kardashian turned 45 years old on Thursday. And to celebrate her day, Kim Kardashian took a moment away from promoting the news SKIMS app and wished her sister a happy birthday. The SKIMS founder posted a picture of herself, Khloe and Kourtney from their vacation in Turks & Caicos. The three are seen posing on the beach, wearing black bikinis and showing off their iconic figures. In the caption, Kim reminisced on their memories of watching their own children enjoy the things they did when they were younger. She wrote: “Happy Birthday Queen @kourtneykardash There’s no…