In his continuing series of backstage photo books, fashion photographer Greg Kessler released SS11 last week. As the title suggests, it covers the spring 2011 collections in New York, Milan, and Paris, capturing the backstage atmosphere (and near inevitable mayhem) at shows from Alexander Wang to Haider Ackermann to Jean Paul Gaultier. There's top models all over, posing, preening, and goofing off, as well as close-ups of the clothes and the styling process. Info on the full book is on Greg's blog, and here's a selection of the shots it features – including Lindsey Wixson, Anja Rubik, and Fei Fei Sun.