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This image provided by RR Auction shows a photograph marked "not to be published" of a teenage Diana Spencer before she became Princess of Wales, with a young friend seated beside her. RR Auction in Amherst, N.H., says the photo sold Thursday, Jan. 24, 2013 to a real estate investor from San Diego for $18,306, well above early estimates. Stamped February 1981 on the back, the photo was taken around the time Charles, the Prince of Wales, and Lady Diana Spencer ended months of speculation and announced they were to be married. (AP Photo/RR Auction)

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