Lady Gaga is gearing up to walk in Thierry Mugler’s Paris fashion show tomorrow. "I’m making my debut as a runway model, walking in the MUGLER PARIS FASHIONSHOW 3/2. I directed the show music, previewing Government Hooker," tweeted the pop singer. Nicola Formichetti—creative director for french designer Mugler—who is also Gaga's stylist and took on the fashion director role for her "Born This Way" video, will be streaming the live show and backstage preparations on Facebook tomorrow (March 2) at 3 p.m. ET.