I don't think it is just her shape, she has obviously gained weight. Her pear shape means her lower half has always been larger than her top (and I agree - difficult to dress!), but check out her upper arms in the recent pictures. They are considerably larger than before. It really looks like she's gained all over, and the big & billowing dresses she's choosing lately are not helping. Also in half the pics, she's holding a purse or shopping bag in front of her stomach.
I don't follow her personal life... is there any possibility she's pregnant?