A tiara worn by Britain's late Princess Diana, is displayed 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 2 months ago

A tiara worn by Britain's late Princess Diana, is displayed 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.