Charles Spencer, brother of Britain's late Princess Diana, poses with his sisters wedding dress during a press 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 28 months ago

Charles Spencer, brother of Britain's late Princess Diana, poses with his sisters wedding dress during a press 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.