Chris Brown Credit: Instagram

Chris Brown has found a new way to offend.

The "Don't Wake Me Up" singer, 23, shared his Halloween 2012 costume via Instagram on Wednesday: Brown and four of his friends dressed as Arab terrorists.

"Ain't nobody f--king wit my clique!!" the star wrote of a shocking photo -- in which Brown, donning "white face" makeup, a long beard, turban and traditional dishdasha or thobe (the ankle-length garment worn by men in Islamic cultures), waves a gun, with ammo strapped across his chest.

Flanked by his similarly dressed pals (all of them also waving guns around), Brown stares menacingly in the camera for the shot, taken in a parking lot in front of a sports car.

Brown reportedly attended a Halloween party at Hollywood hotspot Greystone hosted by on-again, off-again love Rihanna, whom he attacked in February 2009.

Over the weekend, he is also have said to attended a Halloween party alongside Karreuche Tran, another girlfriend, from whom he split a few weeks ago.