Kristen Stewart isn't exactly, for lack of a better word, charismatic. Although impossibly gorgeous, Kristen is known for being a little, um, cringe-worthy in her public appearances. In fact, she's been referred to as the "most awkward person ever."
Here's the thing, though: She doesn't care. She knows she isn't nearly as charming or witty or comfortable as most other celebs, and she's fine with that. In a recent interview, KStew said, "I'm just not very good at TV, and it's not my main goal in life to get good at it. People are like, 'She just can't handle' -- for lack of a better word -- 'the spotlight.' No, actually I can't, and that is who I am."
I respect that immensely. But a note to Robert Pattinson, who may or may not be planning a birthday party for Kristen: Don't do it. KStew hates birthday parties, as well.