JUSTIN BIEBER GOES BARE NUDE TO SING FOR GRANDMA

I really think this justin guy is goin Nuts.. jeez..

The pics were apparently taken during the Thanksgiving holiday last year at his Gran's house in Toronto.

Sources told TMZ that Justin woke up late on Thanksgiving morning and decided to prank his family by stripping to his birthday suit, as you do, belting out lyrics such as "I Loooove you grandmaaaa ... how are youuuu ... helloooo grandma."

He's nuts that Justin Bieber.