Pop star Justin Bieber was photographed naked holding a guitar reportedly during a performance for his grandma and New York Post reported Monday that a video surfaced online of the performance.

TMZ obtained photos, published Monday, of the 19-year-old singer nude while reporrtedly at his grandmother's home in Toronto during Canadian Thanksgiving in 2012. He wore nothing but decided to cover up his privates with a guitar for his serenade.

Bieber's lyrics were along the lines of "I loooove you grandmaaaa ... how are youuu ... helloooo grandma."

Sources told the website that Bieber was staying at his grandmother'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 and decided to play a prank on them by appearing nude and belting out a song. Bieber's grandmother reportedly thought the prank was funny, but then begged the singer to go back to his room and put some clothes on.

Bieber almost experienced a wardrobe malfunction over the weekend hen his pants were on the verge of falling around his ankles during a concert, Mirror reported. As he sang his debut hit Baby in a concert at Jacksonville, Fla., his red pants reportedly slid down his legs as he tried to pretend it was some part of the look.

Bieber continues to travel for his Believe world tour.

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