Prince Harry looks at his bride, Meghan Markle, as she arrived accompanied by Prince Charles, Prince of Wales during their wedding in St George's Chapel at Windsor Castle on May 19, 2018 in Windsor, England. Jonathan Brady | WPA Pool | Getty Images

Prince Harry and Meghan Markle gazed into each other's eyes and pledged their eternal love Saturday as they married at St. George's Chapel in front of hundreds of celebrity guests and millions of viewers around the world. The American actress arrived to a fanfare and walked down the aisle accompanied part of the way by Prince Charles and by 10 young page boys and bridesmaids. The children included four-year-old Prince George and three-year-old Princess Charlotte, children of Prince William and the Duchess of Cambridge. Markle's sleek white dress, designed by British designer Clare Waight Keller, had a boat neck and was made of silk. Her veil came to her waist in front and billowed out for many feet behind her long train. Harry and best man Prince William wore dark formal military dress, with white gloves and the frock coat uniforms of the Blues and Royals, and Harry kept his full red beard intact. As Charles and Meghan drew close to the altar, Harry said: "Thank you, Pa." To Meghan, Harry said: "You look amazing." Markle seemed poised and confident as she delivered her vows without so much as a quiver in her voice. She smiled broadly as the Archbishop of Canterbury Justin Welby declared them husband and wife. Harry seemed a bit nervous — but happy. A host of celebrities and athletes — including Oprah Winfrey, Idris Elba, Elton John, George and Amal Clooney, Serena Williams, James Corden and David and Victoria Beckham — watched the ceremony in the gothic chapel at Windsor Castle. Prior to the festivities, Queen Elizabeth II honored her red-headed, 33-year-old grandson with a new title: the Duke of Sussex. That means that Markle is now the Duchess of Sussex.

Prince Harry (L) and Prince William, Duke of Cambridge the wedding of Prince Harry to Ms Meghan Markle at St George's Chapel, Windsor Castle on May 19, 2018 in Windsor, England. Shaun Botterill | Getty Images

The wedding was 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 — was 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. 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." It is a time of transition for the British monarchy, one that seems filled with hope as William and Harry — the two sons of Charles and the late Princess Diana — step ever more confidently into the limelight. Many in the crowd, like Ana Karukin, a Brazilian nurse living in Florida, said they came to witness a moment of history. "We've got to be here for him and for her, my Meghan, my special girl, to support them, because it's a beautiful time," she said. "I wish that Diana was here, but she's in heaven watching over them."