Is it good to eat a high fat diet and do crunches and other abdominal excercises? ?

My body measurements are 36 30 38. I really want an hourglass figure lately i've been so into it that ive been looking at porn photos daily (no i have no interest in the sex im not into to that) but because the ladies in it always seem to have a perfect body. I have nice size breast already so i was thinking if i try a high fat diet ill no doubt gain weight around my hips but if i do abdominal excercises daily it will prevent the weight from gaining in that area. Is this a good idea to get a curvy figure or is there a better way to get an hourglass figure? please help !