I thought I'd give her another chance. Perhaps I've misjudged her. I looked these pics closely, and for some time I may add, but in the end I think I was correct.
Compare Britney's butt with that of Michelle's below. In some of the earlier pics of Britney, her butt does have a little shape to it, but in the later ones it's positively chubby, and not chubby in a cute way. Michelle's is as trim as anyone could ask for, and Michelle has talent in addition to her sweet little seat.
I guess all we can hope for is that Britney returns from rehab a little more toned and shapely.