^^Her thighs aren't that thick. Her upper body is just really tiny. I think even Kelly is thicker than her...
Imo Beyonce only looks bigger because she is less compact than Kelly. Her hips are a bit more spread or wide but her thighs are the same. Kelly just has a bigger arse, but that makes her look a bit bigger as well. It's those hips I tell you! Kelly's hips are tiny.