Alan Jackson‘s oldest daughter Mattie Jackson Smith revealed that she’s having a baby in 2024. The author and podcast host announced her pregnancy on social media with a carousel of photos of her, husband Connor Smith, their dog and an ultrasound. “We are absolutely thrilled to share Baby Boy Smith coming this June!” she writes. Mattie Jackson (33) is Alan Jackson’s oldest of three daughters.She married Connor Smith in Florida last May. This will be the couple’s first child.Mattie Jackson was previously married to Ben Selecman, who died in 2018.Related: Inside Alan Jackson’s 44-Year Love Story…