Finneas marries Claudia Sulewski with Billie Eilish officiating

Finneas O'Connell, brother of Billie Eilish, has married his longtime girlfriend, actress Claudia Sulewski.

The couple exchanged vows over the weekend at San Ysidro Ranch in Santa Barbara, with Billie Eilish officiating the outdoor ceremony. 

The celebration took place in the presence of a star-studded guestlist, including Justin and Hailey Bieber, Kristen Bell, Dax Shepard, and Emma Chamberlain, among others. Eilish’s boyfriend, Nat Wolff, also made an appearance.

Sulewski wore multiple Oscar de la Renta-designed looks throughout the wedding weekend, with her ceremony gown featuring an off-the-shoulder design paired with a scarf-style neckpiece. 

“We were putting it on, and I was saying, there’s something about this dress that just demands a moment of silence,” Sulewski told Vogue in a final dress fitting ahead of the wedding.

Eilish also joined one of Sulewski's dress fittings virtually, expressing how emotional she felt seeing her soon-to-be sister-in-law in her wedding look. 

“My God, I can’t believe it,” the Grammy winner said over a Facetime call. “You look like an angel. Sorry to be interrupting. Love you so much.”

O'Connell and Sulewski first met in 2018 through a dating app, and their relationship quickly became a source of creative inspiration for O'Connell, who wrote a song about her shortly after they met. Sulewski also later appeared in the music video for one of his songs Mona Lisa, Mona Lisa.

The couple then got engaged in September 2025 during a romantic outdoor proposal.