Since by definition puberty is when breasts and hair (among other things) develop, it's ridiculus to call a female form with them pre-pubescent. Of course, that doesn't mean it won't happen. Not having enlarged breasts doesn't mean someone is pre-pubescent either. Post-pubescent females come in all shapes and sizes. (yippeee!!!)

Before they made me they broke the mold!
http://home.roadrunner.com/~kflach/