Most likely you have already tried a few different diets.
When you lose fat, your butt muscles make a bigger part of your butt shape which will make it look better shaped.
Same thing with your stomach, make it leaner and smaller, then your well exercised butt will look bigger and better shaped.
Probably you have found out if you are reading this, that body fat is easier to collect than to lose it.
There are two ways to get rid of the excess fat.
First way is to exercise.
Doing different fat burning exercises 3 - 4 times a week and eating relatively healthy, is a sure way to get results.
It is though time consuming, and many feel jogging, swimming, etc.
hard to do.
These people could try such sports like tennis, squash or badminton with a friend, they are excellent to burn fat.
Although exercising burns fat, you still need to look after what you are eating and you have to exercise hard.
When you exercise, you should break a sweat and feel that you are really doing something.
You are exercising for yourself! Workout hard and results will come, workout in a sloppy manner and you will see no results.
Other main way to lose fat is to diet.
There are many different diets around and the truth of the matter is that using them will get you to lose fat, but problems start after that.
Many times the end results are even worse when compared to your beginning, when your diet stops you'll easily start to eat again like a horse and gain all the lost excess fat and more back.
So dieting alone is not the answer, you need to do change your whole eating habits.
Eat less calories and you'll body will use the excess fat, this way you don't have to eat so little that you are always hungry.
Losing body fat will get your butt to show it's shape.
You should exercise your butt to get more shape into it and exercise abs to get your stomach leaner, which will make your lower body look nicer and butt show even more.