HI Katie-
I am not sure about Disney photography. But I had my engagements and wedding pic by Randy Chapman who will come to Disney property and do them at the hotels. I am sure that many of the girls here will say that a lot of the photographers will do the same.
That being said are you wanting an in park experience? You would probably need to contact Disney Photography.
Also now through Photo pass you can have a session at the GF for 25, if you buy the photopass CD, that may be an option. Not sure how much you are wanting to spend.