We hear that during rehearsals for the Kennedy Center Honors that Chris Rock flipped out on a producer.

He was allegedly told to stand on a specific "X" on the stage -- but, since Chris didn't like being told where to stand, he said, "I'll stand wherever the f*ck I want."

Chris' tantrum delayed rehearsal for about 30 minutes. It is rumored that he will not be invited back ... "ever."