Country star Thomas Rhett drops by to guest host this week's edition of CMT Hot 20 Countdown. Tune in as Rhett gives us a behind-the-scenes scoop on his latest video, "Make Me Wanna," takes on our Cornhole Challenge and brings a game of his own for Cody Alan, "Doubting Thomas." Also on the show, Jason Aldean's ready to walk down the aisle. Get details on his upcoming wedding plans. Then Cole Swindell, Brett Eldredge, Lady Antebellum and Carrie Underwood reveal the songs they can't get enough of, and Blake Shelton talks about his hook-up hit.