CMT Hot 20 Countdown heads south for the Bayfest Music Festival in Mobile, Alabama. Enjoy the show as we catch up with Frankie Ballard. Plus, we'll tell you what hobby mom-to-be Carrie Underwood is putting on hold and get a first look at Florida Georgia Line's performance of "Get Your Shine On" from Instant Jam. And is Jason Aldean eloping? We've got the scoop. Then find out where Keith Urban's sexy video, "Somewhere in My Car" debuts on the countdown.