No, I don't think that Kristen Stewart is an INFJ. I think that it is obvious that she is an Introverted intuitive because she is knowledgeable and intelligent. She seems to be highly philosophical and rational without possessing an active social side. read more
Stewart described herself as being awkward, shy, and a loner as a kid. Watch some interviews of her and its evident that she has strong social anxiety. She is extremely mature and serious, even as a teenager, a trait correlated with introverts. read more
YouTube - Kristen Stewart on David Letterman Kristin Stewart is definitely NOT an F. F people usually would socially laugh along with Letterman cracking jokes; I don't think Ts would automatically 'socially' laugh along. read more