Justin Bieber Forgot The Words To Ariana Grande's Song As He Joined Her Onstage

TMZ

Justin Bieber appears on stage at the Comedy Central Roast of Justin Bieber at Sony Pictures Studios on Saturday, March 14, 2 — Justin Bieber appears on stage at the Comedy Central Roast of Justin Bieber at Sony Pictures Studios on Saturday, March 14, 2015, in Culver City, Calif. (Photo by Chris Pizzello/Invision/AP)

Justin Bieber lost it with Ariana Grande Saturday night in Miami.

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