Justin Bieber as God brought him to the World (Pics)

The singer gave a serenade to his grandmother without any clothes

New pictures of Justin Bieber are all the rage in the networks, and the pop singer appeared totally naked in her grandparents' house to surprise them with a serenade.

The photos were leaked by website of "TMZ" were taken last year, at Thanksgiving, show Bieber covered only by his guitar his grandmother having fun is trouble in sending him to dress.

Justin Bieber is uncovered. Without modesty and to surprise his grandfather, the teen idol appeared nude in the doorway of her grandmother to surprise her with a serenade. The only garment with which the singer was covered was the guitar which amenizaría the evening.

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.

Thanksgiving -- they go balls out.

Via: TMZ