Eight Years, One “I Do”: Finneas Marries Claudia Sulewski With Billie Eilish Officiating

Some love stories move fast. This one took eight years, a dating app match, two Finneas songs, and a mountaintop proposal — and it just ended (well, began) at the altar. Finneas O’Connell, the Grammy-winning producer behind sister Billie Eilish’s biggest hits, married longtime girlfriend Claudia Sulewski this past Saturday, and the internet is understandably obsessed.

I Do: The Wedding at a Glance

A Wedding That Kept It in the Family

Rather than hiring an outside officiant, the couple handed the job to the person who knows Finneas best: his sister. Billie Eilish officiated the ceremony herself, held outdoors at the lush, exclusive San Ysidro Ranch. Billie wasn’t just working the ceremony either — she sat front row with boyfriend Nat Wolff, alongside the siblings’ parents, Maggie Baird and Patrick O’Connell, making the whole affair feel less like a celebrity event and more like a genuinely intimate family moment that happened to have a five-star guest list.

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The Guest List Read Like a Red Carpet

Naturally, when your sister is one of the biggest names in music, the guest list gets interesting fast. Justin and Hailey Bieber were in attendance, along with Kristen Bell and Dax Shepard, Nina Dobrev, Jason Sudeikis, Emma Chamberlain, Carter Gregory, Stassie Karanikolaou, and Rachel Sennott. It was, by every account, a star-studded affair — but one that still centered around two people who’ve quietly built a life together outside the spotlight.

The Dress: An Oscar de la Renta Moment

Sulewski wore several Oscar de la Renta looks across the wedding weekend, but the ceremony gown stole the show: a strapless ball gown with a drop-waist bodice and an elegant neck scarf. Speaking to Vogue during her final fittings, the “Shrinking” actress described the dress as something that “calls for a minute of silence.” Even Billie joined the fitting by video call, telling her soon-to-be sister-in-law she looked “like an angel.”

A Love Story Written in Songs

Finneas and Sulewski met on a dating app back in 2018, and it didn’t take long for the romance to make its way into his music. He wrote the song “Claudia” about her early on, and she later became the muse — and the star of the music video — for his 2022 track “Mona Lisa, Mona Lisa.” The couple got engaged in September 2025 during a mountain date, announcing it with a simple, heartfelt “forever and ever 9.22.”

As one of music’s most enduring low-key celebrity couples, their wedding closes out a very public eight-year chapter with a very private, family-first ceremony. For fans following Billie Eilish‘s journey alongside her brother’s, this milestone adds a warm, personal footnote to a career built on close family collaboration.

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