I hate to beat a dead horse, but I just wanted to clarify something. Debbie Allen is indeed a member of DST. I graduated from Howard University and have seen the delta sorors "ooo-oop" her with my own two eyes at football games; I have seen her do the pyramid hand sign when she sat right NEXT to me (I studied dance and therefore was in the College of Fine Arts - the same college she and Phylicia graduated from). I highly doubt that the woman would front and I doubt even more than the members of Delta, Alpha chapter would call her if she wasn't indeed a member of their organization.
also, just to add more cents in the pot, haha...as a dancer, and therefore performer, I have to portray different characters. as someone else already pointed out, if an actor is playing a part, and that part calls for them to be a member of a greek organization, then so be it. I don't find it disrespectful in any way because when that scene is done the shirt comes off.