21 Sexy Instagram Photos of Justin Bieber To Make Him Your #MCM

3/2/2015 12:18 AM PST

21 Sexy Instagram Photos of Justin Bieber To Make Him Your #MCM


Justin Bieber is finally 21 ... making him the most deserving of your #ManCrushMonday love.

Check out the 21 hottest reasons to celebrate the Biebs today -- one for every candle on his cake!

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