Kourtney and Scott's youngest, a son named Reign, was born on Dec. 14, 2014, exactly five years to the day after his older brother. In the years since his birth, his playful personality has been on full display on both his mom and dad's Instagrams.
On his fifth birthday, Kourtney shared a photo of herself and Reign, writing: "My silly baby is 5 years old today. Life has so much more meaning with this wild, sensitive boy who has shown me the world through such different eyes."