By Selena Hill (staff@latinospost.com) | First Posted: Aug 13, 2013 01:14 PM EDT

While Beliebers may be ecstatic to see Justin Bieber's naked bum in recently leaked pictures, other viewers may easily find the Canadian singer's naked guitar photos to be more jarring than anything else.

On Monday, TMZ posted two photos of the 19-year-old singing sensation in the nude that quickly went viral. In the first photo, Bieber's man parts are hidden by a guitar. "It's my d--k in a guitar!" TMZ captioned the photo. The second pic shows the pop star's bare backside. [See photos.]

Both photos were taken in October 2012, when Bieber was a few months past his 18th birthday.

As weird as the photos are, the back story behind the obscene pics is even more bizarre. According to TMZ, inside sources revealed that the teen heartthrob overslept on Thanksgiving morning when he stayed over at his grandmother's house. Because his family and friends were annoyed by Bieber's tardiness, the teen decided to lighten the mood with a prank, so he grabbed his guitar and began playing a song while naked.

"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," writes the gossip site.

Apparently, Bieb's family and friends found the antic quite amusing, even though granny begged him to get back in his room to "put some damn clothes on."

Last month, Bieber was busted for marijuana possession after a small amount of pot was found on one of his tour buses during an U.S. border search.

The bus was attempting to enter the U.S. from Canada via the Ambassador Bridge, according to Kenneth Hammond, chief officer and public affairs liaison for U.S. Customs and Border Protection in Detroit. During a secondary inspection, a police dog alerted authorities to the presence of drugs. Customs officers then found and seized a small amount of marijuana intended for personal use as well as drug paraphernalia, reports the New York Daily News.

The 19-year-old Canadian singer was not on the bus at the time, reports USA Today.

The bus driver was issued a civil penalty, and the bus and its passengers were then released, the border patrol spokesman said.

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