This weekend on The iHeartRadio Countdown with Mario Lopez the very talented Ally Brooke will be joining us! She has a brand new memoir out called 'Finding Your Harmony' and new music out as well! Plus she's working on her first ever movie! So we'll catch up with her and talk all things Ally Brooke. Of course we'll also be counting down the top 20 songs in the country, playing some of Mario's favorite throwback songs and more!