Plenty of celebrities are already signed up for the Heart Truth Red Dress Collection fashion show to kick of fashion week. Katie Couric will wear Carmen Marc Valvo, 90210 castmates then and now Jennie Garth and Tori Spelling will wear Badgley Mischka and Betsey Johnson, and Hilary Duff and Nastia Liukin will even share the catwalk.

But one notable has yet to RSVP. Will Michelle Obama take part, as first lady Laura Bush has in the past, like last year at left?

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