Yeah, and you can tell. That's what I got annoyed with, is that you could tell she was trying hard. I've always loved her music (and still do), but never really watched any of her interviews before. Is she always like that? It came across as really pathetic to me.
She IS being somewhat natural here, in the sense that she really is comfortable with Chelsea. However she's very aware of the audience. But a lot of her her interviews are genuinely funny/interesting (though I'm liked the Chelsea one ><).