Britain's late Princess Diana's, wedding dress and train is shown during a preview of the exhibition Diana: A Celebration at the National Constitution Center in Philadelphia, Thursday, Oct. 1, 2009. The exhibition is scheduled to run Oct. 2 through Dec. 31 at the center. AP Photo logo AP Photo 2 months ago

Britain's late Princess Diana's, wedding dress and train is shown during a preview of the exhibition Diana: A Celebration at the National Constitution Center in Philadelphia, Thursday, Oct. 1, 2009. The exhibition is scheduled to run Oct. 2 through Dec. 31 at the center.