This weekend's edition of CMT Hot 20 Countdown is full of treats. Tune in as Kellie Pickler serves as co-host alongside Cody Alan. She'll give us a sneak peek of her new CMT docu-comedy, I Love Kellie Pickler, talk about her red carpet fashion statements, get in the Halloween spirit, and more. Also on the show, Tim McGraw opens up about his brand new collaboration, "Top of the World." Plus, Reba jet sets around the world and tells us about her adventures, and we take a closer look at this year's CMA entertainer of the year nominees.