Show: Pretty Little Liars

After her best friend disappears, Benson's character, Hanna, takes over as the most popular girl in school, but not before losing a little weight. Yup, Hanna's secret is that she was a former fatty, which was actually just a pillow under Benson's shirt, as they make it seem in flashbacks. The producers liberally cut some corners because they knew viewers watch the show to see her pretty face, anyway.