Because they are like ordinary women. Women all over the world are embracing their bodies, their femininity and their comfort and with that comes dressing to make us happy and comfortable.
Celebrities, though famous, are still people and they do what people do. If you want to go without cruelty, you go girl, if you do not, the same will happen for you.
Do people notice? Most likely. But why should you care about what someone else thinks about you other than yourself?