We all know that Kim Kardashian is no stranger to elective surgery, but her supposed breast implants are the least likely procedure she's gotten. Granted, it's very possible that she's gotten them though. This photo really isn't a faire comparison because she's only about 16 in the before photo.
Hmmm... breast implants or not? The picture says it all... "maybe."
The bottom line is that Kim Kardashian is way to busty to be natural. Not many 5' 3" have a DD bra cup size. Also, keep in mind that she's definitely had other elective surery, so would you really put a boob job past her?