Justin Bieber Poses Naked With Guitar

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NEW YORK, NY - AUGUST 02: Justin Bieber performs during his 'Believe' Tour at Barclays Center of Brooklyn on August 2, 2013 in New York, New York. (Photo by Kevin Mazur/WireImage) | Getty


Justin Bieber is wise enough to know when a gift needs givin' ... but he didn't have a box -- so he covered his junk with a guitar and jammed out a naked serenade for one lucky lady fan -- HIS GRANDMA!

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