The archbishop of Canterbury has declared Prince Harry and Meghan Markle husband and wife.
Justin Welby, the head of the Church of England, has made the proclamation after the couple promised to love and cherish one another “till death us do part,” and exchanged rings.
The British-American pair are now officially known as the Duke and Duchess of Sussex, and the duchess will take her place among senior members of the royal family.
Saturday's ceremony took place at St. George's Chapel in Windsor, the British royals' longtime home.
Thousands of well-plumed guests and enthusiastic royal fans streamed into Windsor on Saturday, all seeking to capture their piece of the British extravaganza that is the royal wedding of Prince Harry and Meghan Markle.
Oprah Winfrey, Idris Elba, Elton John, George and Amal Clooney, Serena Williams and David and Victoria Beckham walked in the bright sunshine onto the grounds of Windsor Castle. They are among 600 celebrities, royalty, athletes and family friends invited to St. George's Chapel, where the wedding will start at noon (1100GMT).
As the day got underway, Queen Elizabeth II honoured her red-headed, 33-year-old grandson with a new title: the Duke of Sussex. That means that Markle will become the Duchess of Sussex when she says “I will.”
The wedding is a global event, thanks to Harry's status as a senior British royal and Markle's celebrity after starring on the U.S. television series “Suits” for seven years. The wedding pomp and ceremony - complete with Anglican prayers and tradition, classical music, a gospel choir and a horse-drawn carriage ride through Windsor - will be beamed live to tens of millions of TV viewers across the world.
Relatives at the ceremony included Charles Spencer, the brother of Harry's late mother Princess Diana, and Harry's cousin Zara Tindall and her husband. Also in attendance was the family of Prince William's wife Kate: Parents Carole and Michael Middleton, sister Pippa Middleton and brother James Middleton.
Prince Harry's ex-girlfriend Chelsy Davy was also among the congregation, as was Sarah Ferguson, the Duchess of York, the ex-wife of Harry's uncle Prince Andrew.
Outside the castle, thousands of fans crammed the streets of Windsor. Irene Bowdry, a lawyer from California, was aboard the jammed early train to Windsor. She booked her trip to England as soon as the wedding date was announced.
“An American in the royal family, isn't that so exciting?” she said.
The weather was balmy and clear, bathing the ancient stones of Windsor Castle in a beautiful spring light. Royal fans have been camping outside the castle for days, and British police have stepped up security, with sniffer dogs, barricades and patrols all over town.
“Windsor is absolutely bursting with excitement,” said royal historian Hugo Vickers. “There are cardboard cutouts of Meghan and Harry in every shop window, virtually. There's bunting all over the place. I've never seen so many people in the streets of Windsor.”