Justin Bieber stopped by Ariana Grande's concert in Miami this weekend to join her onstage... but he didn't have enough time to learn the lyrics to "Love Me Harder." Whoops! Do you think this was just a simple mistake anyone could make, or is Bieber just the WORST? Subscribe for more videos! http://full.sc/NfhdwD

Justin Bieber Flubs Ariana Grande Lyrics: https://www.youtube.com/watch?v=GyrCBZmDOHM
Justin Bieber and Ariana Grande Live in Miami: https://www.youtube.com/watch?v=Adq7eY-mnkc

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Edited by Alex Jones