This weekend on The iHeartRadio Countdown with Mario Lopez we have a brand new #1 song in the mix! Looks like Ed Sheeran and Justin Bieber have finally broke through with their smash hit 'I Don't Care'. Plus Mario talks about the birth of his third child Santino Rafael Lopez, plays some of his favorite throwback songs and of course counts down the rest of the top 20! Tune in!
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