For Justin Bieber, the show might have to go on, but not without some controversy first.

One day after he collapsed onstage in London on Thursday night, and confirmed he'd perform at the O2 Arena on Friday (March 8), he got into a verbal, nearly physical, altercation with the paparazzi.

While making his way around London, from an unidentified location to an awaiting SVU, the 19-year-old singer got into an argument with a group of photographers who had been waiting to snap a shot of the beleaguered singer. In a video posted on TMZ, Bieber, with his bodyguard in tow, tried to swiftly get into the vehicle and avoid having his photo taken, pushing up against whoever was in his way.

Once inside, the car, a photographer is heard saying "That's assault." When Bieber's camp tried to explain that he was in their way, another photographer responded with, "F--- off back to America. F---king little moron."

Bieber must have heard the conversation because the car door opened and he lunged at the photographers, responding with "What the f--- you say?" While attempting to make physical contact with the paparazzi, he gets restrained by a bodyguard, adding, "What the f--- you say? I'll f---ing beat the f--- out of you." The photographers respond again, and Bieber makes one more attempt for them, before being escorted into the vehicle by his team.

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Shortly after the incident, Bieber took to Twitter to address it. He wrote, "Ahhhhh! Rough morning. Trying to feel better for this show tonight but let the paps get the best of me... Sometimes when people r shoving cameras in your face all day and yelling the worst thing possible at u...well I'm human. Rough week."

He continued that he was still intent on hitting the stage Friday night, despite the incident. "Not gonna let them get the best of me again. Gonna get focused on this show tonight. Adrenaline is high now. Gonna put it on the stage," he said. "Only way someone can break u is if u let them. Night 4. O2. London. #BELIEVEtour."

Is Justin to blame for the paparazzi scuffle? Sound off in the comments!