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Being on tour, Justin Bieber has probably had some long and rigorous dance rehearsals. Well, it looks like all the practice is paying off judging by one of his most recent photos posted to his Instagram and Twitter accounts. The photo shows Justin at one of his rehearsals, and it looks like he has a little six pack going on!

If you've ever wondered what Justin has going on underneath his shirt, there's your answer. Not exactly monstrous body-builder material yet, but still looking good!Keep it up Justin!

Photo Credit Getty Images and Instagram