Rumors that Kim Kardashian had breast implants have been around for years, but they're most likely untrue. Before and after photos reveal that her bra size has actually stayed pretty much the same since she was a teenager. She's only around age 16 in most of the before pictures, so it's hard to make a fair comparison. With the age gap, her breast size is only a 1/2 cup to a full cup size bigger.
You can only see the top of her bust in the before photo, so it's hard to make a good comparison.
Kim Kardashian is definitely way too young to make a good comparison in this picture. If she had a boob job, it would have only been about a cup size increase tops.
Again, her bra size is bigger by about a cup. However, she's only 16 or 17 years old in the before photo. Also, her body fat is a little higher in the after photo. Overall, it looks like Kim Kardashian probably didn't have breast implants, so you can cross that one off the list!