On this weekend’s iHeartRadio Countdown with Mario Lopez, Mario breaks down the 20 biggest songs of the week and reveals who has de-throned last week’s champ to become our new Number 1! Plus, we catch up with the First Family of Social Media the D’Amelio’s to get the scoop on season two of their Hulu reality show, Heidi & Charli competing on Dancing With The Stars, Dixie’s future music plans, & more! Our Throwback Track takes us back 9 years to when the Jonas Brothers broke up & Sandra Bullock dominated the Box Office in Gravity! All that & so much more!