Most probably, I won't recognize her. They do what they do because there is very little chance of them being recognized. Even if someone recognizes a pornstar it is very likely that they won't be in a position to acknowledge it and approach her to express appreciation for her work.
If I recognize her, given the right circumstance I will ask her for her autograph and tell her that I am a fan of her work without mentioning what work, because if I mention her work and she doesn't want it to be mentioned, it would very well be considered sexual harassment.