Kellie Pickler joins us on this weekend's edition of CMT Hot 20 Countdown. Tune in as the blond beauty co-hosts the show and gives us a glimpse at the new season of I Love Kellie Pickler, which kicks off Aug. 25. Also on the show, Maren Morris explains the irony behind her new single, "80s Mercedes." Then we chat with Dolly Parton about her tour and new CD, Brett Eldredge preps his pup for stardom and Rascal Flatts hit a major milestone. Catch all this and more Saturday and Sunday morning at 9/8c.