The Cartier "Halo" tiara, worn by Britain's Catherine, Duchess of Cambridge on her wedding day, is prepared for display at Buckingham Palace in London July 20, 2011. Buckingham Palace expects record crowds, up to 650,000 people, to past the dress worn by Kate Middleton at her royal wedding to Prince William. The ivory and white garment, designed by Sarah Burton for Alexander McQueen, won over the fashion press and public. [Photo/Agencies]

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