The rain did not dampen the newlyweds' spirits as they posed for photographs outside All Saints Church, which is located in Kemble, Cirencester, close to where bride Harriet grew up.
The blushing bride, 45, chose a column-style dress with a lace neckline and sleeves, and a dramatic train designed by Emilia Wickstead. There had been speculation in the lead-up to the ceremony as to whether Harriet would wear a tiara, and she did not disappoint. The jewels chosen were the Pragnell family tiara, as well as a set of earrings.
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Peter and Harriet were supported by their bridal party, including his teenage daughters from his first marriage to Autumn Kelly – Savannah, 15, and Isla, 14 - and Harriet's daughter, Georgina.
The groom's divorced parents, the Princess Royal and Captain Mark Phillips, his stepfather Vice Admiral Sir Timothy Laurence, his sister Zara Tindall and her husband Mike, were seen among the guests.
WATCH: Newlyweds Harriet and Peter share a kiss
The King and Queen were also in attendance, as well as the Prince and Princess of Wales, and the Duke and Duchess of Edinburgh, and Princesses Beatrice and Eugenie and their respective husbands, Edoardo Mapelli Mozzi and Jack Brooksbank. .
See all of the best photos from Harriet and Peter's special day in the gallery below…
Accompanied by her daughter, Georgina, and her two new stepdaughters, Savannah and Isla, as her bridesmaids, Harriet looked ethereal as she arrived at the church.
An insider told HELLO! that Harriet was taking deep breaths in the car before getting out, calming her pre-wedding jitters in a very relatable moment.
The bride and groom sheltered under a white parasol as they emerged from the church after tying the knot.
Early 2024: The Parent Trap
The couple reportedly meet at a children's sporting event. Bonding over their shared experiences as devoted parents, the pair quietly hit it off away from the public eye.
12 May 2024: Badminton Habits
Peter and Harriet officially go public with their new relationship at the Badminton Horse Trials. Pictured holding hands, the couple join Peter's two daughters, Savannah and Isla, and chat warmly with Queen Camilla.
June 2024: By Order of the King
The couple receive an invitation from King Charles to join the traditional royal carriage procession onto the Berkshire racecourse before watching the races from the Royal Enclosure.
July 2024: Formula for Love
Harriet joins Peter and his royal cousins — including Princess Beatrice, Princess Eugenie, and Zara and Mike Tindall — in the paddock at the British Grand Prix at Silverstone. Days later, the duo look loved-up at Wimbledon.
1 August 2025: A Girl's Best Friend
After a little over a year of dating, Peter proposes to Harriet with a timeless trilogy diamond engagement ring. An official statement shared with HELLO! confirms the happy news.
25 December 2025: It's Good to Walk
Harriet firmly cements her status in the royal family, joining their annual Christmas Day stroll to St Mary Magdalene Church on the King's Sandringham estate.
1 April 2026: Cirencester Call
An official spokesperson for the couple releases a statement confirming their upcoming nuptials: "Mr Peter Phillips, the son of HRH The Princess Royal and Captain Mark Phillips, and Ms Harriet Sperling, daughter of the late Mr Rupert Sanders and Mrs Mary Sanders of Gloucestershire, have today announced their wedding date. The summer wedding will take place at All Saints Church, Kemble, Cirencester, on Saturday, June 6, 2026, in a private ceremony."
The rain did not dampen anyone's spirits as the bridal party, made up of Peter's daughters, Savannah and Isla, and Harriet's daughter, Georgina, assisted with the bride's train and veil.
The Prince and Princess of Wales were all smiles as they arrived, with Kate choosing a cream dress by Roland Mouret and a Jane Taylor boater hat for the occasion.
The couple were not accompanied by their three children, Prince George, Princess Charlotte and Prince Louis.
Peter's cousins, Princess Beatrice and Princess Eugenie, broke cover to attend the wedding.
The York sisters have largely stepped back from the public eye recently to focus on their growing families and to navigate the ongoing media scrutiny surrounding their parents - Andrew Mountbatten-Windsor and Sarah Ferguson.
Beatrice, wearing a floral printed Emilia Wickstead dress, sheltered from the rain under her umbrella with her husband, Edoardo Mapelli Mozzi.
Princess Eugenie dressed her blossoming baby bump in a navy ensemble with matching accessories. She and her husband, Jack Brooksbank, are set to welcome their third child this summer. The couple are already parents to sons, August, five, and Ernest, three.
The groom's mother, the Princess Royal, chose a yellow coat and a floral dress for her son's wedding, with a sentimental hat first worn for her daughter Zara's christening in 1981.
Peter Phillips and Harriet Sperling will be marrying in a Cotswolds ceremony on Saturday, and on Friday they were seen with other royals at a rehearsal dinner