​Pippa Middleton, radiant in a custom-made wedding gown, married a wealthy financier Saturday as two likely future British kings and other members of the royal family, including her sister, looked on.

In what was seen by many as the society wedding of the year, Middleton — the younger sister of Kate, the Duchess of Cambridge — and hedge fund manager James Matthews said their vows in a ceremony at St. Mark's Church in Englefield, west of London. Before the wedding, a crowd of well-wishers and reporters gathered outside the church grounds, hoping for a glimpse.

The wedding party included three-year-old Prince George as a page boy, and two-year-old Princess Charlotte, a bridesmaid. Both are the children of the Duchess of Cambridge.

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Pippa Middleton arrives for her wedding to James Matthews at St Mark's Church in Englefield, England, Saturday. (Kirsty Wigglesworth/Associated Press)

Prince William and Prince Harry arrived together wearing formal morning suits. They seemed relaxed as they strolled into the church — perhaps relieved they didn't have a role to play in the wedding party.

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Matthews, 41, smiled broadly and sported elegant formal wear set off by a blue vest.

Middleton, 33, came to the church accompanied by her father Michael in a vintage Jaguar convertible. She wore a custom wedding gown designed by Giles Deacon, a long veil by prominent hat-maker Stephen Jones, and a sparkly tiara.

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Catherine, Duchess of Cambridge, talks to her daughter Princess Charlotte of Cambridge, who participated as a bridesmaid, following the ceremony. (Justin Tallis/WPA/Getty Images)

The dress was constructed with a high neckline and a corseted bodice, with draping to the front and a heart-shaped detail in the back. Deacon said the lace bodice was embroidered with pearl details over a layered organza-and-tulle underskirt.

"(It was) a privilege to show the craftsmanship that my team produces in London and a real testament to Pippa's support of British fashion," he said.

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Kate, the Duchess of Cambridge, right, arranges the train of the bridal gown. (Kirsty Wigglesworth/Associated Press)

Father and daughter had a quiet moment together before entering the church, and church bells rang out as the couple emerged after saying their vows. They were fortunate in their timing — it rained during the ceremony, but the sun had returned before they stepped out of the church.

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Swiss tennis player Roger Federer, centre right and his wife, Mirka, leave after the wedding ceremony. (Justin Tallis/Associated Press)

Tennis star Roger Federer and his wife Mirka were among the guests, as was reality TV personality Spencer Matthews, the groom's well-known brother and one of the stars of Made in Chelsea.

The Duchess of Cambridge gracefully ceded the spotlight to her younger sister Saturday. Kate wore a long-sleeved, blush pink Alexander McQueen dress and focused on making sure the young page boys and bridesmaids behaved — which they reportedly did.

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St Mark's Church is seen ahead of the wedding. (Kirsty Wigglesworth/Reuters)

The bride's parents, Carole and Michael Middleton, had an elaborate glass marquee built on the grounds of their estate in nearby Bucklebury for the lavish wedding reception Saturday night. Guests were advised to bring two outfits so they could change after the wedding ceremony.

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Pippa Middleton arrives with her father, Michael Middleton, in a 1951 Jaguar Mk V car. (Justin Tallis/AFP/Getty Images)

Security was tight amid a media frenzy in which #PippasWedding was trending on social media but guests were forbidden from sharing pictures there.

The airspace above both villages has been closed to prevent intrusive press crews from flying overhead or launching drones to get video footage.

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James Matthews and Pippa Middleton smile for the cameras after leaving the small, 12th-century church. (Kirsty Wiggleswort/Associated Press)

There was some speculation that Harry will bring his American girlfriend, actress Meghan Markle, star of the TV legal drama Suits, to the reception.

Their relationship has become serious in recent months, with Harry speaking out to ask the press to respect their privacy. Suits is filmed in Toronto. In the end Markle did not attend the ceremony.

Middleton had several serious boyfriends before Matthews proposed last year. She has written a book about entertaining and columns for Vanity Fair while also working at her parents' lucrative Party Pieces business.

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Britain's Prince George waves as he leaves in a car after attending the wedding of his aunt. (Justin Tallis/Associated Press)

Her figure-hugging gown attracted attention at the 2011 wedding of Kate and Prince William, sparking completely unfounded rumours that she was dating Prince Harry.

Ingrid Seward, editor of Majesty Magazine, said the Middletons could take pleasure in the day: their first daughter, Kate, had married a future king, and their second daughter, Pippa, had married an extremely wealthy, charming and handsome man.

"You can't do better than that," she said.

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Kate follows the bride after her wedding. (Kirsty Wigglesworth/Associated Press)

With files from Reuters