That brings up an excellent point, DeeDee. A lot of people don't work out all of their muscle groups evenly. You want to think symmetry and balance. So while, Mimi, your goal is to build the perfect behind, you have to also remain cognizant of the rest of your physique and making everything flow.
Don't forget to work your shoulders, your back, your chest, arms, and traps so that they all fit together with your glutes, hammies, and quads. And don't forget those calves either, which put a finishing touch on the legs.
When you do your squats, be sure your knees don't bend in, and never lockout on leg exercises. You can injure your knee joint, but you also take away the tension from the muscle upon which you wish to focus. Keep this in mind for leg press, squats, and hack squats especially.
I also wonder why girls take so many supplements...like a whole army's worth of them? I'm noticing this a lot lately. Who recommends this? I'm trying to think back to when I began lifting. I may have used protein powder while powerlifting, and I know I tried creatine but didn't see any significant results (tried it once again while doing figure and still didn't notice any true differences), but I really believe that when building a foundation, you should just pick one to three sources that you really believe are best for your regimen and then get down and dirty in the gym and the kitchen. There just aren't any substitutes for work ethic and good, real food.
That being said, I think you should hold onto your BCAA's, glutamine, and protein powder for a quick source of protein and scrap the rest. And don't forget your vitamins.