A worker poses with "Kate Moss, for Calvin Klein Obsession campaign 1993" by photographer Mario Sorrenti, at Christie's auction house in London September 4, 2013. The work is estimated to sell for 12,000 GB pounds (US$ 18,500) when auctioned in the sale "A Celebration of Kate Moss", from the collection of gallery owner Gert Elfering, in London on September 25.[Photo/Agencies]