Princess Diana 's wedding to Prince Charles on July 29, 1981, remains the most expensive royal nuptial in modern history, with today's equivalent cost estimated at $140million, a RadarOnline.com audit of The Firm's nuptials reveals.

The event at St. Paul's Cathedral, which hosted 3,500 guests, has long been remembered as the "wedding of the century" for its scale, opulence, and iconic fashion choices. Article continues below advertisement

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A then 19-year-old Diana wore a $115,000 silk-and-taffeta gown adorned with 10,000 pearls, designed by David and Elizabeth Emanuel.

The reception included 27 confection

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