Damn she got a Phat Azz 
Optical illusion my friend. Just like Flex Wheeler looked bigger than 216 pounds.
The chick has a mean arch in her back, and is leaning fwd in heels, with her legs splayed out. But, then look at the shots with her standing straight up---bye, bye illusion.
But, to me, she looks better than most of the bikini/fitness girls with their starved greyhound look.