Billie Eilish officiates brother Finneas’ wedding in California
Billie Eilish took on a special role over the weekend, officiating the wedding of her brother Finneas O’Connell and his longtime partner Claudia Sulewski.
The couple married in an outdoor ceremony in Montecito, California, on Saturday 29 August, after around eight years together.
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Eilish, 24, conducted the ceremony at San Ysidro Ranch, wearing an off-the-shoulder green gown as her brother and Sulewski exchanged vows in front of family and friends.
Several famous guests attended the wedding, including Justin and Hailey Bieber, Kristen Bell and Dax Shepard, alongside other figures from the entertainment industry.
Sulewski, 30, wore an Oscar de la Renta gown for the ceremony, featuring a drop-waist bodice and pleated skirt.
It was one of four outfits created by the fashion house for her wedding weekend.
Finneas, 29, and Sulewski first met in 2018 and announced their engagement in September 2025 after seven years together.
Eilish and Finneas are also longtime musical collaborators.
He has co-written and produced much of his sister's music, with the siblings winning multiple awards together, including two Oscars for Best Original Song.
The Montecito ceremony marked the latest milestone for the siblings, who have frequently spoken publicly about their close personal and professional relationship.