I thought this was pretty interesting, so I went to LL's website.
He has pics from back in the day as well as recent photos. If he has had some work done, it's VERY good. I myself think his nose is like that due to his weight loss. If you look at his older pics, you can see that his nose, as well as the rest of his face is a lot chunkier. But if you look at the pics from today, his entire face is a lot thinner and more defined.
Check him out for yourselves:
LL Cool J