Oh no! Is Justin Bieber OK?!

The 19-year-old pop star was at the piano playing "Believe" during a concert in Dubai tonight when a crazed fan jumped up on stage and grabbed him from behind.

Justin's bodyguards immediately stopped the amorous assault, but the whole thing created a couple of moments of complete chaos with Justin's piano being knocked over and crashing on to the stage.

Worried fans were freaking out during the melee and one can be heard in the video shrieking "Oh my God Justin!! Are you ok?!"

According to TMZ, Justin was totally OK, because they say he went on with the concert as if nothing had ever happened.

Such a pro...

Are you surprised that the fan was even able to reach Justin with all the security he has?

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