A crazed Justin Bieber fan rushed the stage of JB's Dubai concert on Sunday, grabbing the singer and then overturning a piano before being nabbed by security.

Bieber pulled free of the man immediately, then the fan was tackled by security guards after flipping a grand piano on stage.

The consummate professional, Justin continued on, uninterrupted and later returned to the stage for encore performances of "Boyfriend" and "Baby."

In fact, the Biebs seems to be working on his image as of late after his tour bus was found with marijuana on board in Sweden and his childish actions during a visit to the Anne Frank museum in Amsterdam made headlines. During the singer's recent concert in Turkey, Justin stopped twice during his performances to honor Azan, the Islamic call to prayer that Muslims observe five times daily.

Fans took to Twitter in support of the singer ... a few Tweets read, "I’m not a Justin Bieber fan but as a Muslim, I got a lot of respect for him cos of what he did," and "You can hate all you want, but he earned my respect. Muslim performers don’t even do what you did."

Maybe the Biebs' recent reunion with on-again-off-again flame Selena Gomez is the reason for Justin's happy spirit!