Billie Eilish Just Officiated Her Brother FINNEAS' Wedding — And The Guest List Was STACKED 💍

Stop scrolling, because Billie Eilish just added "wedding officiant" to her résumé — and honestly? We are NOT okay. 💚

FINNEAS O'Connell (yes, the Grammy-winning producer and Billie's brother) just married his longtime love Claudia Sulewski in what might be the most beautiful celebrity wedding of 2026, and the "Birds of a Feather" singer was the one who made it official.

According to Page Six, the couple said "I do" on Saturday at the ultra-luxe San Ysidro Ranch in Montecito, California, surrounded by their closest family and friends. And when we say "close," we mean it — because this guest list was absolutely STACKED.

The A-List Turnout Was Insane

Justin and Hailey Bieber? Check. Kristen Bell and Dax Shepard? There. Jason Sudeikis, Nina Dobrev, Emma Chamberlain, Rachel Sennott, and Stassie Karanikolaou? All in attendance. Billie's boyfriend Nat Wolff was also there to support the happy couple.

E! Online reports that Billie stunned in an olive green off-the-shoulder gown as she officiated the outdoor ceremony. Can you imagine getting married with one of the biggest pop stars on the planet officiating? The vibe must have been IMMACULATE.

The Tea ☕

• FINNEAS and Claudia met on a dating app in 2018 — he literally wrote a song called "Claudia" the first night they hung out
• They got engaged in September 2025 during a romantic mountaintop helicopter proposal
• Claudia wore FOUR custom Oscar de la Renta looks throughout the wedding weekend (rehearsal dinner, ceremony, reception, and afterparty)
• Billie virtually crashed Claudia's final dress fitting via FaceTime to gush over her soon-to-be sister-in-law

From Dating App to Forever

The love story? Absolutely cinema. FINNEAS, 29, and Claudia, 30, first connected on a dating app back in 2018, and according to The Hollywood Reporter, the producer knew something was special from the very first night.

He told BuzzFeed in a 2019 interview that he wrote his song "Claudia" within hours of meeting her and sent it to her immediately. Talk about making an impression! The YouTuber and Cyklar Skincare founder also inspired his 2022 track "Mona Lisa, Mona Lisa" and even starred in the music video.

The Proposal Was Peak Romance

When FINNEAS popped the question last September, he went ALL OUT. The couple took a romantic helicopter ride to a mountaintop at sunset, where he got down on one knee. They announced the engagement with matching Instagram posts captioned "forever and ever 9.22" — and yes, that date holds special meaning because FINNEAS had posted a heartfelt anniversary tribute on September 22, 2022.

In that post, he wrote: "You'd have to scour the globe to try to find someone equally as talented, creative and hard working as you are, my love. Then you'd have to do it a second time to try to find someone as kind, thoughtful and generous."

Claudia's response at the time? "Your vows are going to destroy me." And honestly, same.

Four Oscar de la Renta Moments

For her big day, Claudia went full bridal royalty. Vogue reports she wore four custom Oscar de la Renta designs across the wedding weekend, including an elegant ivory silk faille ballgown for the ceremony that featured a drop-waist bodice, pleated skirt, flowing train, and a draped scarf detail that connected to the train.

During her final dress fitting, Claudia gushed about the ceremony gown: "We were putting it on, and I was saying, there's something about this dress that just demands a moment of silence."

And Billie, watching via FaceTime, agreed: "My God, I can't believe it. You look like an angel. Sorry to be interrupting. Love you so much."

The Secret Nearly Killed Him

FINNEAS opened up about keeping the engagement secret on The Tonight Show Starring Jimmy Fallon last year, admitting: "I'm very relieved that it happened. I feel like it really taught me that I'm not cut out to rob banks or steal cars or something because I was keeping a joyous, happy secret for several weeks, and it ate me alive."

If planning a proposal stressed him out that much, we can only imagine how wedding planning went! But based on the stunning photos and A-list turnout, it looks like everything came together perfectly.

The newlyweds haven't personally shared details about their big day on social media yet, but with that guest list and Billie as the officiant, we're betting the photos are going to be ICONIC when they drop.

So, the real question: Would YOU want your famous sibling to officiate your wedding, or would that be too much pressure? Sound off below! 👇

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Sources:

• Page Six
• E! Online
• The Hollywood Reporter