Credit: Rick Diamond/Getty Images

Pop phenom Justin Bieber turns 18 today (yesterday he tweeted, "almost legal"), and to mark the momentous occasion we’ve pulled together 18 trivia questions to test your Bieber IQ.

Baby, baby, baby, are you up for the challenge? Take our quiz to prove you’re a true Belieber — and join Wetpaint Entertainment in wishing J-Biebs a happy 18th!


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