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!
TMZ has obtained photos of a completely nude Biebs
strumming away on his big wooden instrument ... at his grandmother's
home in Toronto during Thanksgiving back in November 2012.
And why, you ask, did Bieber go ass naked for g-ma?
Our sources tell us JB had been staying at his granny's house during the
holiday ... and slept in a little too late on Thanksgiving morning.
Bieber
finally woke up after hearing family and friends stirring around the
house -- so he thought he'd prank 'em ... by grabbing his guitar and
playing a naked set a la Jenny from "Forrest Gump" ('memba that?).
We're
told birthday-suited Bieber went right up to his grandma and started
belting out some impromptu lyrics ... like, "I Loooove you grandmaaaa
... how are youuuu ... helloooo grandma."
We're told G thought it
was pretty funny -- and everyone in the home was cracking up -- but
granny begged the pop star to get back in his room to put some damn
clothes on, stat.
