i almost exclusively make mine of non-stars. i make lots of people i know and it works pretty damn well, even just using instagram and facebook pictures/vids. the key is a good model file (i never start a new one, i just keep using the same one and make occasional backups) and more importantly finding a very good match for the person you're trying to fake.
i'd post examples of my success but obviously these files are very private. all i can say is it's possible, yes, and often works very well given time and effort of finding a good model to match.