In reply to Rach.

Rihanna has never had a big box booty like many she has always been ,long, lean and fashion model type body. She will never be fat its not her body make up. People often get being fat mixed up wit not being healthy and you can be healthy no matter fat or skinny ,you know.
Rih losses weight and admitted it and is blooming back out right now perhaps she don't have quite as much stress on her as she used to with all the things that goes on in a young super star life.