ICYMI, Anna Wintour made her debut on The Late Show with David Letterman last night to discuss her documentary, The September Issue, and all things fashion. As expected the Vogue editor held her own in her Carolina Herrera dress as Dave dished out the fashion jokes and references to her ice queen reputation — Anna rebuttled, I'm "Lukewarm Royalty with a Whip from Outer Space." Dave even asked her if she's ever put anyone in a headlock. No doubt, Anna prevailed and even showed off her fun sense of humor. Anna, we knew you would be fabulous. Check it out.