I can only find it on Facebook, too.
So yes, I don't think it's real. Like I said, even Blake looks generated to me.
The other girl just looks like a generic ID generated face.
And if the whole thing is generated, then that explains why the image can't be found anywhere other than on Facebook.
Which then leads you to ask why someone would want to create a fake pic using actual porn stars, when so many real pics are out there. The whole point of it must be to place this mystery person (who isn't even real herself) amongst well-known faces to make it look "legit".