Kourtney Kardashian has been on cloud nine since her engagement news to Travis Barker.RELATED: Kourtney Kardashian's $1 million engagement ring is nothing like Kim and Khloe'sAnd while Scott Disick has yet to speak out about the news, the Talentless founder interacted with his ex on social media over the weekend in a sweet post.The Poosh founder had shared a selection of photos of their youngest son Reign, six, from the past month, captioning it: "Reign in October."VIDEO: Kourtney Kardashian