Grammy-winning singer-producer Finneas married YouTuber, actress and skincare entrepreneur Claudia Sulewski on Saturday 30 August at San Ysidro Ranch in Santa Barbara, California, with the ceremony officiated by his sister and long-time collaborator, Billie Eilish. The wedding caps a seven-year relationship that began when the pair met on a dating app in 2018, and follows their September 2025 engagement announcement, marking a significant personal milestone celebrated alongside close family and prominent friends from the entertainment world.

The intimate ceremony was attended by the couple's parents, Maggie Baird and Patrick O'Connell, as well as guests including Justin and Hailey Bieber, Emma Chamberlain, Jason Sudeikis and Kristen Bell, with Eilish bringing boyfriend Nat Wolff. Sulewski wore four different Oscar de la Renta outfits across the wedding weekend, and the pair, who have previously collaborated creatively including on Finneas's 2022 track "Mona Lisa, Mona Lisa," celebrated with their two dogs in attendance.