If Hollywood is soon to lose Nicole Kidman to motherhood, at least she's going out in a blaze of glory! The actress appeared on Letterman last night to promote Australia (we've seen it, and we feel safe in saying that Kidman's nose gives her finest performance ever), and the host/guest interaction was so uncomfortable that even Kristen Stewart sent Kidman flowers afterward (with a note attached that said, "Damn, girl. Loosen up!").Hard to say exactly what went wrong, but things simply seemed off from the start, as Kidman seemed acutely unable of more than two-word responses, and repeatedly failed to pick up on David Letterman's conversational cues. "I'm just smiling!" Kidman insisted. Oh, so that's what that was!