Getting Rid of Belly Fat??

Hi! I am in month 2 of Insanity. I have only lost 20 lbs... since JANUARY!! I eat well- meaning I eat GOOD foods (most of the time), and I don't eat too much either. My legs, arms, and shoulders look beautiful, but I have this spare tire around the middle that is going NOWHERE. I have this thick sheet of abs--- that's covered by a layer of belly fat. Does anyone have any tips on how to best get rid of it? It's getting very frustrating. And I thank you in advance!