Kat Schwartz. She was doing a magazine shoot where she was depicted topless and smoking a cigarette, although the actual shots for the mag/web were cropped so you didn't see much past the top of her breasts. Unfortunately for her and the mag, the person editing the images didn't sanitize the metadata, and it still included the full-size thumbnails of the images. Those got recovered and released to the wild.

Fwiw, I wasn't really that impressed, but then again small boobs don't really do it for me.