I posted briefly last week about the Christie's auction, but missed this detail.
While not the priciest item up for auction that day, Cindy Sherman's "Untitled #96" from 1981 passed all records for photography, and was sold for $3.89 million. According to ArtInfo.com, the buyer was New York dealer Philippe Segalot, and the underbidder was Per Skarstedt, also a New York dealer. Christie's confirmed that this was a record for a photograph at auction, previously held by Andreas Gursky's "99 Cent II Diptychon," which fetched $3.35 million in 2006.