PHOTOS 18+: Justin Bieber Goes Completely Naked to Serenade Lady Fan …And Then Some!

New pictures leaked to TMZ of the pop singer strumming away on his guitar completely nude hit the internet yesterday, August 11.

But what makes them even more shocking is that they were reportedly taken during the October 2012 Canadian Thanksgiving holiday as he jammed out a naked serenade in Toronto for one lucky lady fan
- HIS GRANDMA Diane according to TMZ!

In the first picture, Justin is totally naked, covered only by an acoustic guitar. And the second shows Justin from behind (keyword “behind”), as the naked pop singer strums away for his shocked-looking grandmother!

But who, you ask, took these pictures? Was it Justin’s grandpa? And why did Bieber go butt naked for grandma?
He was said to have overslept that morning and finally woke up after hearing family and friends stirring around the house and decided to play a little prank on them by going nude and playing a naked set a la Jenny from "Forrest Gump"!

Birthday-suited Justin reportedly strolled up to her and began singing some impromptu lyrics like, “I Loooove you grandmaaaa … how are youuuu … helloooo grandma”.

Grandma was reportedly amused by the show and everyone else in the house was cracking up. But Biebs’ grandma later started begging for her grandson to get back to his room and put some clothes on.

From his shirtless summer escapades in New York City:

 Through his baring his butt on Instagram:

To stripping down to nothing but red boxer briefs and a pair of zebra-printed pants, which were nearly down to his knees, while in concert in Nashville, Tennessee on Jan. 18:

 And now this latest prank, all I can say is, ‘na so e dey take start o’.