Bieber's nude doorstop serenade for grandma

Justin Bieber serendaded his grandmother in the nude, it has been reported. Photo / AP

Justin Bieber reportedly serenaded his grandmother in the nude.

Newly revealed images show the 19-year-old completely naked apart from a guitar covering his private parts on the doorstep of Diane Dale's home.

According to celebrity website TMZ the incident took place at Justin's grandmother's home in Toronto during Canadian Thanksgiving in October, 2012.

The teen heartthrob is said to have slept in late on Thanksgiving morning, missing the family's celebration.

When Bieber woke up, he allegedly decided to prank the family by grabbing his guitar and playing a naked set.

The website reports his grandma thought the prank was hilarious.

Dale is the mother of Bieber's mum Pattie Mallette and she helped raise the singer.

In July, she gave an interview about her grandson's controversial behaviour, which has included peeing in buckets and apparently spitting on innocent bystanders.

Dale defended her grandson against the criticism he received, telling Ottawa's CTV that his antics are completely normal.

"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," Dale told celebrity website RadarOnline.

Bieber's popularity was apparent at the weekend's Teen Choice Awards, where he scooped the choice male artist award and took the crown for the hottest Twitter personality for his social networking updates.

"4 years in a row. #tcas. That's love. Thank u. Enjoying the break. But always here. Thank u. This is forever :)," Bieber tweeted after the awards ceremony held in Los Angeles.

- Cover Media