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Justin Bieber is proving that he's a pro, after a fan jumped on stage and attempted to grab him mid-performance in Dubai on Sunday.  His rep tells E! that the star is doing "fine" following the incident. 

The rep explained that one male fan managed to get past security and rush onstage while the Biebs was seated at the piano singing "Believe."  Fan footage shows the fan crashing into the piano and knocking it over as security runs onstage to detain him.  The site reports that Bieber carried on with the concert as if it didn't happen, although the piano was unusable for the rest of the night.  

Overzealous fans wasn't the only drama surrounding Bieber's visit to Dubai.  The star reportedly showed up two hours late at the same venue on Saturday night, according to local paper "Al Arabiya." 

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