Kate Moss made her way to Paris to make an unannounced cameo on the Louis Vuitton Fall '13 runway, and showgoers went wild! The 39-year-old supermodel has all but retired from walking the runways but made an exception for her longtime pal Marc Jacobs today. When she wasn't on the catwalk, we also spotted the British beauty trying out a look from the just-debuted Saint Laurent Fall '13 collection. Watch on for all the style scoop. On Allison McNamara: Joie top, Club Monaco jacket, Luv AJ rings.