Her and Kelly Osbourne have similar face and body structures, they're deceptively small, but they have quite large round head.I‘m not saying she actually IS fat, ofc she is NOT, she is quite slender, but she looks it in the picture.
As I said, she looks like a pretty, cute fat woman, according to her face in that picture.
If Anna's happy with her round face, more power to her, but if I had a moonface (this is a technical term) I wouldnt have that blunt bob. She looked better with longer wavy hair