New behind-the-scenes footage from the "Material Girl" shoot with Taylor Momsen, Madonna, and her daughter Lourdes, Alexander McQueen’s memorial set for September, Sofia Coppola’s directing again for Dior, and Rachel Bilson and Kate Bosworth wear Fall's hot color, red! Plus, Justin Timberlake’s line William Rast collaborates with Target, all in this week's Fab Flash!