The hits just keep on coming for Justin Bieber, who was caught on tape lunging at a photographer in London and screaming “I’ll f**king beat the f**k out of you!”

For the past week, the singer has been exhibiting increasingly erratic behavior – from appearing onstage hours late at one of his concerts to wearing a gas mask out to dinner.  Then on Thursday night, he was taken to the hospital after reportedly passing out backstage during a show.

And now this.

Apparently the 19-year-old was leaving a hotel with his entourage when he bumped into one of the several photographers waiting outside. The photographer began insulting Bieber, and which point he is shown jumping out of the car while shouting “The f**k did you say?” (You watch the footage on TMZ.com)

Despite the pop star’s best efforts, his security team managed to hold him back and wrangle him back into the SUV.

Bieber quickly addressed the incident on Twitter, writing:

“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,” he added. “Rough week.”

What do you think is going on with Justin Bieber? Is he having a breakdown or just a bad week?

[Source credit: Nick Mundy]