This weekend on The iHeartRadio Countdown we've got a special guest host! While Mario was out running around in New York City Alessia Cara is taking over the Countdown! She'll be talking all about her new album 'The Pains of Growing', playing some throwback classics and breaking down her big plans for 2019. Of course she'll be counting down the top 20 songs in the country as well! Tune in!
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