Pageant tiaras are in. And it's not just beauty-pageant contestants who are fighting over pageant tiaras. In the past year, rhinestone studded pageant tiaras have become big sellers among fashion-forward free spirits. Today, women are buying pageant tiaras to wear at holiday parties, proms and weddings. The glittering pageant tiaras are featured prominently on film. In the movie Miss Congeniality, Sandra Bullock plays a federal agent who goes undercover at a beauty pageant to track down a serial bomber and ends up tussling over a pageant tiara. Pageant tiaras are even popping up at society parties, such as Elton John's White Tie & Tiara Ball, an annual charity fund- raiser held at the pop star's opulent estate in Windsor, England. And just about every recent high-profile celebrity wedding has included a high-priced pageant tiara. When Madonna married British film director Guy Ritchie in Scotland just before Christmas, she wore an Edwardian pageant tiara on loan from London jeweller Asprey & Garrard. Catherine Zeta-Jones wore an antique pageant tiara borrowed from New York jeweler Fred Leighton when she married Michael Douglas last month. And former Miss America Heather French wore a $1 million Belgian pageant tiara when she married Kentucky Lt. Gov. Steve Henry.