Justin Bieber bares his bottom, covers his modesty with a guitar...

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He's often seen showing off his torso by going shirtless, especially of late.

But Justin Bieber shocked his family when he did the full monty during a bizarre nude prank at his grandmother's house in Toronto during Canadian Thanksgiving back in October 2012.

In photos obtained by TMZ, the 19-year-old is seen covering his private parts merely with an acoustic guitar, jamming out a naked serenade for his granny, Diane Dale

Nude Justin was staying at his grandmother's home in Toronto when the strange incident went down.

According to the website, Justin had been enjoying a break at her home during the holiday and slept in a little too late on Thanksgiving morning.

Finally waking up after hearing family and friends stirring around the house, he thought he'd play a prank on the unsuspecting clan by grabbing his guitar and playing the naked set.

The pop star went right up to his grandmother and started belting out some impromptu lyrics, singing: 'I Loooove you grandmaaaa ... how are youuuu ... helloooo grandma'.

While his family and friends were laughing, his giggling granny begged the pop star to get back in his room to put some clothes on.

Justin's grandmother Diane recently defended her grandson in an interview with CTV Ottowa.

Speaking about all the attention Justin's actions attract, Diane said: 'It's totally crazy. I feel sorry for Justin all the time because paparazzi pick on him all the time. Anybody else's kids have done the same thing but nobody says anything.'

She added: 'He's just a 19 year old boy. And before you criticise him, say, what is my 19-year-old boy doing?'

Picture Courtesy:  TMZ

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