It's a mystery as to whether or not Jennifer Lopez had a nose job. While before and after photos try and prove that she had the plastic surgery, it's definitely not for certain. It looks like her nose was a little bit bigger in 1998. It's hard to tell though...
Here's Jennifer Lopez has a teenager. Does it look bigger to you there?
In this before and after photo, it looks like her nose used to be more pressed in. It's almost as if she got a second nose job to rebuild the bridge. It's possible that she had 2 nose jobs: one that removed too much bone and one to rebuild it.
Again, her nose looks jagged and unnatural. It's hard to find a consistency with Jennifer Lopez's nose - which indicates she may have had plastic surgery.
In the before picture, it looks like her nose used to be more prominent. As I elluded to before, it's possible that this happened: