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iHeartRadio Countdown - Mandy Moore in Studio!

This weekend on The iHeartRadio Countdown with Mario Lopez the incredibly talented Mandy Moore will be stopping by! She of course stars in the biggest show on TV 'This Is Us'! Mario is a huge fan, so we'll catch up with her and talk engagement, music and more! Plus rumors of a new #1, a countdown debut for Charlie Puth and more! Tune in!