Article continues below advertisementCheers! Kourtney Kardashian is celebrating three years of sobriety.The Poosh founder, 46, was commemorating the launch of sister Khloé Kardashian's newest Khloud protein popcorn flavor and noted the big milestone.Article continues below advertisementKourtney Kardashian Reveals She's on a Sobriety JourneySource: @kourtneykardash/InstagramKourtney Kardashian released her newest Khloud popcorn flavor on January 16.Kourtney posted a video to her Instagram Stories on January 16, where she showed off a bag of Khloé's latest truffle white cheddar popcorn.