CHRIS BROWN GOES BESERK!!! RAGES!!!: TMZ's reporting CHRIS BROWN exploded in rage behind the scenes at "Good Morning America" today SMASHING A WINDOW and STORMING OUT shirtless because ROBIN ROBERTS kept asking about the RIHANNA beat down. 

Chris did all he could to make the conversation all about his new C.D, which is out today... but Robin wouldn't let up. According to TMZ's sources, after the interview, Brown stormed into his dressing room screaming so loud the people in hair and makeup got scared and called security. Chris was so out of control, by the time ABC security arrived he'd shattered a window with a chair and left the building shirtless, blowing off another performance he was supposed to do for the ABC website.

Brown later tweeted, "I'm so over people bringing this past s**t up!!! Yet we praise Charlie sheen and other celebs for there bulls**t."  Story developing!  ALL the dirty details on MIKE&TRICIA'S next Hollywood Dirt Report!!!