We're celebrating the Christmas season with America's heroes on this week's CMT Hot 20 Countdown. Tune in as the men and women of the United States Armed Forces say hello to their families and select the 20 videos for the countdown from the U.S. Naval Base in Bahrain. Also on the show, Luke Bryan, Dierks Bentley, Tim McGraw and more stars get curious in our favorite Celebrity Chainmails. Plus, Jennifer Nettles gets candid in our Hot 20 questions, and we get ready for Nashville's CMT premiere. Enjoy the show Saturday and Sunday mornings at 9/8c.