Girl I fell in love with turns out to be fat.

Please help. I fell in love with this girl on Tinder. Her pictures were face shots and she looks super pretty. Not fat or chubby at all. Now I got another picture and she is chubby borderline fat. She did not lie at all. I belive it is my fault that I judged from her face that the rest looks slim too. How do I tell her, that I am not interested without hurting her feelings? The pictures she posted were so flattering, that even my male friends said "wow she is hot!". What can I do?