Movie stars are people that actually exist.
MBTI theory is exactly that. It's ultimately a subjective theory that exists in one's mind. And whatever facts support the theory is more grounded into what a person wants to see. This is why there is so much disagreement when guessing others' types -- each individual who typewatches will see the dimension of that person's personality they want to see. But objectively, all those traits are there and contradict with the theory. It's basically another belief system that, rather than based on internal spirit (like religion), is based on internal logic.