It's been a tough week for 19-year-old Justin Bieber what with the backlash from being 2 hours late to one of his concerts at London's O2 and being hospitalised last night (March 7) after collapsing on stage, and now he's been pictured scrapping with photographers in London.

Earlier today (March 8), the teen superstar had to be restrained by bodyguards after he was ambushed by photographers outside of his Park Lane Hotel and subsequently lashed out at them, which also caused a strong verbal attack. Tweeting about the stressful ordeal, Bieber 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."

"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. Only way someone can break u is if u let them."

Channel 5 News caught the ordeal on camera, which sees Bieber shoving a photographer who then accuses him of assault and tells him to "f**k off back to America". Moments after the 'Boyfriend' hitmaker gets into his car, he re-emerges and asks, "what did you say?"

Watch footage of Bieber's clash with photographers here: