You cannot spot-reduce fat. http://exrx.net/WeightTraining/Myths.html. Your body will determine where fat is stored. The best way to lose weight is to reduce your calorie intake:calories utilized for energy ratio. The easiest and most drastic way to do this is to eat fewer calories per day.
I agree with Jackery - you can't spot reduce. However, aside from limiting your calories, you also should try switching up your exercise routines and your tempo during each session - keeping your body always guessing about what to expect as far as exertion is key to burning fat.