Mackenzie, an Oklahoma native, is mom to son Gannon, and she’s engaged to her baby daddy Josh McKee.
The cheerleader got attention on this season’s 16 & Pregnant by posing in her cheerleading uniform with her baby bump on display and admitting she didn’t go on the pill in fear she’d gain weight.
“She comes from a stable family and seems to have her life in order,” the source tells RadarOnline.com. “MTV wanted someone like that.”
Alexandria lives in Pennsylvania (the same state as Teen Mom 2 star Kailyn Lowry), and is mom to daughter Arabella.
On Alex’s emotional episode she considered giving her baby up for adoption, like Teen Mom star Catelynn Lowell. Her ex-boyfriend and former fiancee, Matt McCann, entered rehab in December for a drug addiction -- something Teen Mom 2 star Jenelle Evans is familiar with.
“Both of them are excited to be on Teen Mom 3,” the source explains. “It’ll be quite a journey. Viewers loved them and can’t wait to see more.”