Of course, this isn't the first time the Biebz has showed up on stage with Grande to sing this song, but unlike that last time in March, he did manage to get all the words right. Good job, Bieber.

Later in the show, Bieber even returned to sing 'All That Matters" off Journals alongside Grande. And to top it all off, Grande helped out on Bieber's 'As Long As You Love Me," showing off her rap skills. Read more - here.

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