Bieber who was attending an event inside Macy's unveiling his new cologne, decided to go outside of the store to acknowledge the fans that could not come inside to the event.
Witnesses say when Justing Bieber came out the doors an unidentified man jumped a barrier and knocked the teen sensation to the ground.

Bieber was not injured but appeared to be very 'shaken up'.

The man who jumped the barrier was taken away by police.
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Hundreds of his devoted fans began lining up as soon as the event was announced on Tuesday.
Earlier in the day Bieber appeared on 'The View'.