justin bieber

Justin Bieber Shows Off His Buff Bod on Instagram [PHOTO]
You flex those muscles, Justin Bieber.
The 19-year-old singer -- who, at this point, may be just as well-known for his shirtless selfies as he is for his music -- gave fans an even bigger thrill on Wednesday when he Instagrammed an ab-baring picture with his personal trainer, showing off his toned ph…

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