This weekend on The iHeartRadio Countdown with Mario Lopez Ludacris will be zooming into the show! He's as busy as ever with new music, a kids learning network launching, movies on the way and more! If you have kids you have to check out his new learning platform Kid Nation! Plus we'll holiday holidays, 2020 and put him ON The Spot! Of course Mario will be counting down the top 20 songs in the country and playing his favorite throwback classics as well. Tune in!