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Kate Middleton, seen here in 2006 at Prince William's commissioning as an army officer, is the bride. She is marrying her college sweetheart after an eight-year courtship.
The groom
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Prince William, seen in this 2008 photo on board the HMS Iron Duke, is the groom. Second in lne to the throne, He is the grandson of Queen Elizabeth II and Prince Philip and the son of Prince Charles, heir to the throne, and the late Princess Diana.
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Lady Louise Windsor is one of Kate Middleton's four bridesmaids. The 7-year-old is Prince William's first cousin and the daughter of his uncle, Prince Edward and Sophie, Countess of Wessex.
Photo: Lady Louise Windsor disembarks the Hebridean Princess cruise ship with other members of the British Royal Family on Aug. 2, 2010, in Scrabster, Scotland.
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Prince William's goddaughter, Grace van Cutsem, 3, will serve as a bridesmaid at the royal wedding. She is the daughter of Rose Astor and Hugh van Cutsem, who is a close family friend of William's.
Photo: Rose Astor and Grace van Cutsem at St. Michaels Church, on Feb. 26, 2011 in Alnwick, England.
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The Hon. Margarita Armstrong-Jones is also one of Kate Middleton's bridesmaids. The 8-year-old is Prince William's second cousin and the daughter of Viscount and Viscountess Linley.
Photo: Prince William, right, holds hands with Margarita Armstrong-Jones at Sandringham Church on Dec. 25, 2006, in Kings's Lynn, England.
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Prince Harry will be his brother's best man. The royal wedding court will also include two page boys - 10-year-old William Lowther Pinkerton, son of William's private secretary, and his 8-year-old godson Tom Pettifer.
Photo: Prince Harry attends a reception on the USS Intrepid on June 25, 2010, in New York.
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Diana, Princess of Wales, is the mother of Prince William. Divorced from Prince Charles, she was killed in a 1997 car accident in Paris.
The groom's grandparents
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Prince William's grandparents, Queen Elizabeth II and Prince Philip, are scheduled to arrive for the wedding ceremony at Westminster Abbey right before Kate Middelton. Following the ceremony, the Queen will host a lunchtime reception at Buckingham Palace for 300 guests.
Photo: Prince Philip holds the hand of Queen Elizabeth II, during the State Opening of Parliament in London, Nov. 18, 2009.
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Prince Charles and wife Camilla, Duchess of Cornwall, will be with Prince William on the evening before his wedding. Before the family evening, Charles and Camilla will attend a pre-wedding reception for British and foreign royals, hosted by Queen Elizabeth's cousin, Lady Elizbeth Anson.
Photo: Camilla, Duchess of Cornwall and Charles, Prince of Wales visit the Artisanal Centre on April 6, 2011, in Fez, Morocco.
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Kate Middleton's younger sister Pippa, 27, will serve as her maid of honor. Her rumored boyfriend, former English cricketer Alex Loudon, is said to be her plus one for the royal event.
Photo: Pippa Middleton attends a wedding at St. Michael's Church in Alnwick, northeast England, on Feb. 26, 2011.
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While Kate Middleton's younger brother, James, who heads a cake-making company, is not part of the official royal wedding court, he will be sitting in the front row, directly opposite of Queen Elizabeth and Prince Charles.
Photo: James Middleton at Saatchi Gallery on July 21, 2009, in London.
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Michael and Carole Middleton, a former flight dispatcher and air stewardess, respectively, live in the small village of Bucklebury near Newbury, Berkshire. The two, who now run Party Pieces, a mail-order party supplies business, will be staying with their daughter before the wedding at the Goring Hotel in London.
Photo: Michael and Carole Middleton outside their home on Nov. 16, 2010, in Berkshire, England.
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Archbishop of Canterbury Rowan Williams will marry Prince William and Kate Middleton at the Westminster Abbey wedding ceremony.
Photo: Archbishop of Canterbury Rowan Williams during the Ninth Inauguration of the General Synod at Westminster Abbey on Nov. 23, 2010, in London.
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The Bishop of London, the Right Reverend Richard Chartres, who has close links to Prince William and his family, will deliver the address at the royal wedding.
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James O'Donnell (right), organist and master of the choir at Westminster Abbey, will direct the two choirs -- the Chapel Royal Choir and the Choir of Westminster Abbey -- during the royal wedding ceremony.
Photo: James O'Donnell, right, conducts the Choir of Westminster Abbey on April 15, 2011. in London.
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The London Chamber Orchestra will also be a featured musical act during the ceremony. The orchestra, comprised of 39 musicians, will be conducted by Christopher Warren-Green (pictured).
Photo: Christopher Warren-Green conducts the London Chamber Orchestra during the 2007 Classical Brit Awards, on May 3, 2007, in London.
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Wing Commander Duncan Stubbs, center, will direct the Fanfare Team of seven musicians from the Central Band of the Royal Air Force during the wedding ceremony.
Photo: Wing Commander Duncan Stubbs during a rehearsal for the royal wedding on April 12, 2011, in London.
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Following the ceremony at Westminster Abbey, Claire Jones, the official harpist to Prince Charles, will perform at the lunchtime wedding reception at Buckingham Palace, hosted by Queen Elizabeth.
Photo: Claire Jones at the Royal College of Music on March 29, 2011, in Kensington, central London.
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Fiona Cairns is the royal wedding cake designer. The cake will be a multi-tiered traditional fruit cake and will be decorated with cream and white icing.
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Royal wedding guests will also enjoy a chocolate biscuit cake made by McVitie's Cake Company. The cake, which was personally requested by Prince William, will consist of dark chocolate, broken up tea biscuits, and some secret ingredients, the firm's cake designer, Paul Courtney (pictured), told the Associated Press.
Photo: Paul Courtney tastes a piece of a trial biscuit cake at the McVitie's factory in Stockport, northwest England, on March 25, 2011.
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Shane Connolly, the royal wedding florist, told the UK's Press Association that the inspiration behind the flower arrangements at Westminster Abbey and Buckingham Palace would be that "everything is sustainable, renewable and appropriate." Connolly, who is based in London, is pretty familiar working on royal events. He was commissioned as the florist for the wedding of Prince Charles and the Duchess of Cornwall in 2005.
Photo: Shane Connolly at Windsor Great Park on April 20, 2011 in Windsor, England.
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Milliner Philip Treacy is said to have designed the hats for Kate Middleton's bridal party and royal guests. Treacy, who created two headpieces for the Duchess of Cornwall's 2005 wedding, told the UK's Telegraph that he will not be attending the wedding, but added, "my hats are, and that's nice."
Photo: Philip Treacy during London Fashion Week on Sept. 22, 2006, in London.