John Luke Robertson, from the TV show Duck Dynasty, and his wife Mary Kate have welcomed their third child, a baby boy named Wells. The couple shared the news on their Instagram pages, along with photos of the newborn. Wells joins his older siblings, John Shepherd and Ella Kathryn. John Luke's mother, Korie Robertson, also shared the news on social media, expressing her excitement for the new addition to the family. John Luke and Mary Kate have both appeared on the show Duck Dynasty. The couple got married in 2015, which was also documented on the show.