Billboard Ranks Music’s Hottest 21 Under 21! Can You Guess Who’s Number 1?! (Pics)

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We recently took a look at Billboard‘s latest list of the hottest music stars under 21, and we can’t say we’re at all surprised by their rankings. Justin Bieber, Selena Gomez, Demi Lovato obvs made the list. But can you guess who else is on there? Think you know who took the No. 1 spot?

Check out these pics to see, and find out if your predictions are spot on!