The Tennessee twosome have a baby daughter together, 7-month-old Jayde Carter, and recently bought a house.
Despite the fact that the couple has been together of more than three years, McKinney's hesitation to propose has been an ongoing topic of discussion on the MTV reality series.
This is the second engagement for Bookout. Ryan Edwards, the father of Bookout's 7-year-old son, Bentley, proposed to the red-headed beauty on 16 and Pregnant in 2009. The pair later called things off and currently have a contentious relationship on Teen Mom OG.