Pop singer Justin Bieber showed off his bare butt in an Instagram photo he posted online on Saturday, Jan. 19, according to Us Weekly.

Wearing a black tank top, a baseball hat, sunglasses and showing off his latest tattoo, the 18-year-old peered over his shoulder and mooned the camera while standing in front of a "Justin Bieber" LIVE poster. See photo here. 

Bieber deleted the image shortly after posting it to his official account, but the magazine noted that it had already been liked more than 15,000 times and received more than 2,700 comments.

The "Beauty and a Beat" singer's manager, Scooter Braun, joked about the image on Twitter, saying, "As a prankster you have to respect another good prank. Only makes sense. #crackdealer." Bieber replied to the comment with "Haha."

Bieber reportedly dropped his pants a second time this past weekend. Hollywood Life reported that Bieber took off his shirt and stripped down to his red boxers and a pair of zebra-printed pants while on stage in Nashville, Tenn., on Jan. 18.

A source close to the singer said Bieber is trying to change his image among his fans, saying he "wanted to move from being pop-py to sexy." Bieber reportedly told Canada's Macleans magazine he is trying to get into better shape, saying, "I've been working out in the gym, getting bigger. Trying to get sexy for the ladies."

Bieber is currently on tour for his latest album "Believe" and his upcoming album, "Believe Acoustic," will be released on Jan. 29. He tweeted on Jan. 13 cover art for the album along with the message "Ready? #newmusic - with everything going on I'm gonna tell u myself how I feel. #15 days."

The Instagram photo of Bieber barring his bottom followed his break up with Selena Gomez right before the New Year's Holiday and the controversy he was involved in when photos that surfaced online made it appear as if he was smoking marijuana.

Tags: Justin Bieber