Enjoy this week's episode of CMT Hot 20 Countdown as the lovely and talented Cam co-hosts the show. She'll talk about her brand new album, Untamed, and she'll even perform her popular single, "Burning House," in our studio. Also on the show, we give a High 5 to our favorite burning hot videos. Then Keith Urban puts his past on display and Garth Brooks has a major announcement. Get all this, plus the scoop on the just-announced Grammy nominations Saturday and Sunday mornings at 9/8c.