Mary-Kate Olsen @ Paris Fashion Week

Mary-Kate Olsen rocks out head-to-toe black at the Giambattista Valli Fall/Winter 2008/2009 Collection held as part of Paris Fashion Week in Paris, France on Thursday.

It was recently announced that Mary-Kate and twin sister Ashley, 21, are working on a coffee-table book about fashion, titled “Influence.”

“Mary-Kate and I have filled ‘Influence‘ with the most interesting, challenging, creative people we know – the ones who helped pave the way for us and our generation,” Ashley said in a statement.

“Ashley and I interviewed the people who have inspired us, with the hope that they will inspire and teach others,” MK said in a statement.

The Victoria Shoe by Giambattista Valli (as inspired by Victoria Beckham); shades by Chanel (Spring 2007, S5018 Black and Gradient Grey); and dress by Valli.