Is Justin Bieber smoking marijuana? CREDIT: Instagram/justinbieber

The Biebs does it again! Well, allegedly. TMZ revealed that there might be one more incident of the young pop star lighting up a joint at another party with a girl who suspiciously looks like singer Ariana Grande. Though sources close to Bieber have denied that he was smoking marijuana, TMZ's photo experts say that the admittedly grainy photo looks consistently real and does not look touched up in any way. Grande's camp also denied that she was the girl in the picture. Both groups have yet to comment on the validity of the picture though.

This is not the first time that the Baby singer has been caught with cannabis. A photo was released in January of this year of Bieber smoking a joint at a Newport Beach party. However, it's worth mentioning that both photos are so grainy and somewhat blurred that the he could just as easily been smoking a cigarette.

Peers of the Biebs have been quick to crack jokes about the issue though; from Demi Lovato tweeting about it to Miley Cyrus tweeting a picture of herself wearing a shirt that had Bieber's likeness smoking a blunt with the words, reefer fever.

Whatever the case may be, the 19-year-old's activities have certainly taken a different turn from his originally squeaky clean image. Last August, Bieber's mother, Pattie Mallete, commented on her son's behavior, stating that she is just as concerned about his antics.

"If it affects the world the way it does, imagine how it affects me as a mom seeing these headlines, I have to talk to him and have our conversations," the 31-year-old mom said.

"We talk about the things that he is going through. We talk about the pressures that he is under and what people are saying and how he feels about it and the questionable things that people are saying that he is doing. We talk and he knows what I think...I definitely am a mom first and I care deeply about what how he is feeling and what he is going through."

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