The 16-year-old shared the message in celebration of the reality star’s 43rd birthday Travis Barker’s 16-year-old daughter posted a touching tribute to Kourtney on Monday, April 18, in honor of the Poosh founder’s 43rd birthday. Alabama wrote over a photo of herself, Kourtney and Alabama’s sister Atiana De La Hoya. “Happy birthday to the best soon to be step mom I