This weekend on The iHeartRadio Countdown with Mario Lopez Mario is out and Courtney is in! Mario is down in Santa Fe, New Mexico filming a new holiday movie so his wife Courtney is taking over the reins. She'll be playing some of her favorite all time songs, counting down the top 20, talking about the kids and more! Plus we'll find out if Olivia Rodrigo can hold down the top spot for a 4th straight week! Tune in!