WATCH: Ariana Grande Sings Good Luck to Justin Bieber for ‘Believe’ Premiere

Published:6:31 pm EDT, December 18, 2013| Updated:6:56 pm EDT, December 18, 2013|
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Ariana Grande is excited for Justin Bieber's Believe premiere and wanted to wish her friend luck on his new movie. Check out this video of Grande singing "good luck" to Justin.

The video was posted by both Grande and Bieber's manager Scooter Braun.

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