This day in history, 1981: Princess Diana and Prince Charles married in front of the world

Dubbed 'the wedding of the century,'Diana married Prince Charles in St. Paul's Cathedral on July 29, 1981. She was 20; he was 32. Diana was the first British citizen to marry an heir to the British throne in 300 years.

According to Britishroyals.info, officiants of the traditional Church of England service wedding included the Archbishop of Canterbury and 25 other clerics.

There were 3,500 people in the congregation at St. Paul's Cathedral. Two million spectators lined the procession from Clarence House. Another 750 million people watched the ceremony worldwide.

Take a look back at the British Royals:

Check out pics from Princess Diana's classic style: