Smudge Tool
For these photos I used the Smudge Tool in Photoshop. I took a photo of a pregnant woman and removed her "baby bump" to make her appear to be thinner. This tool smudges the background around the photo on top of the area you a[pply it to, so for this I just smudged the white background over her stomach and it made her look like she was not pregnant. These are my before and after photos.