How to make my butt bigger?

I'm 15 years old and I already have a bigg butt, my waist is small, and my hips are too, I've gone from a size 3 jeans to a size 7 in less than a year, my butt has gotten bigger than in this picture to the right, I walk but am scared to workout to make it bigger because some people say it will burn it away.. What should I do to make it bigger??

eat a lot.

Ok, I dont understand why you would want a bigger butt if you aleady have a 'big butt' which I dont think... but if it helps you sleep at night, yes working out will make it bigger... suprisingly, it will firm it, and appear even larger, so whoever told you this, did not lie... :]

There are exercises that are for the gluts that can enhance your butt. But from the picture you have up there you are doing alright as you are. I wish my butt looked that good!