Kourtney Kardashian admitted to having breast implants to increase her breast size from a B cup to a C cup. The plastic surgery was actually done totally spontaneously. Kourtney Kardashian said, "It was so dumb ... I just got the idea in my head one day, and that was that. There was no talking me out of it." Either way it was a pretty subtle cosmetic procedure. She shouldn't have too much to worry about. Here's Kourtney Kardashian before and after breast implants. Her breast size is a little bit bigger after the plastic surgery.