CMT Hot 20 Countdown is sure to make your holiday season merry and bright. Tune in as we look back at the biggest and best videos during our year-end special. Plus, we'll relive unforgettable moments from the past year with Luke Bryan, Sam Hunt, Blake Shelton, Carrie Underwood and more of your country favorites. Then we'll take a closer look at Tim McGraw and George Clooney's bromance, and we'll reveal the best of the best from our celebrity chainmail segment. Enjoy all this and more Saturday and Sunday mornings at 9/8c.