Before a flawless exchange of vows, a veiled Middleton wearing a laced dress with a long train, the first "commoner" to marry a prince in close proximity to the throne in more than 350 years, walked slowly through the 1,900-strong congregation.
As they met at the altar William, second in line to the throne, whispered to her, prompting a smile. The Archbishop of Canterbury Rowan Williams declared the couple married with the words: "I pronounce that they be man and wife together."
Tens of thousands of people thronging the streets outside cheered when they heard the words, and again as the newlyweds left the abbey in a 1902 open-topped state landau carriage bound for Buckingham Palace, the queen's London residence.
Huge cheering crowds strained to catch a glimpse of the beaming couple as well as the military bands in black bearskin hats and cavalrymen in shining breastplates who escorted them to the palace where they were expected to kiss on the balcony.
Middleton's dress, the subject of fevered speculation for months in the fashion press, was a traditional ivory silk and satin outfit with a lace applique and train.
It was designed by Sarah Burton of the Alexander McQueen label, named after the British designer who committed suicide.
The bride wore a tiara loaned by the queen and the diamond and sapphire engagement ring that belonged to William's mother Princess Diana, who was divorced from Prince Charles in 1996, a year before her death in a car crash in Paris aged just 36.
Middleton, the 29-year-old whose mother's family had coal mining roots, is a breath of fresh air for the monarchy, which has in the past been accused of being disconnected from ordinary Britons. She is seen as having the common touch.
The royals' cool reaction to Diana's 1997 death contrasted with an outpouring of public grief and marked a low point for the family. Some questioned whether the institution, a vestige of imperial glory, had outlived its unifying role in a modern state divided by partisan politics and regional separatism.
Thousands of people from around the globe were outside the abbey, many of them camping overnight for the best view of the future king and queen and fuelling the feel-good factor that has briefly lifted Britain from its economic gloom.
