In a heartfelt celebration, Finneas O’Connell, renowned musician and the elder brother of Billie Eilish, wed his long-time partner Claudia Sulewski on Saturday, 29 August, 2026, in the picturesque setting of Montecito, California. The outdoor ceremony was not only significant for the couple but also showcased the close-knit bond between the siblings, as Eilish took the honour of officiating the wedding.
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Dressed elegantly in a sage green off-the-shoulder gown adorned with delicate draping, Billie Eilish brought warmth and joy to the ceremony, where she officiated in front of family and friends, many of whom are notable figures in the entertainment industry. Among the guests were Justin and Hailey Bieber, Kristen Bell, Dax Shepard, and Jason Sudeikis, all of whom contributed to the festive atmosphere of the occasion.
Claudia Sulewski, who has made her mark as a host, actress, and founder of CYKLAR Skincare, wore a stunning array of bridal gowns throughout the wedding weekend. According to Vogue, the focal point was an ivory silk faille ball gown that featured intricate designs such as a drop-waist bodice and a structured pleated skirt. Completing the look was an asymmetric, draped neckpiece, which elegantly cascaded along the train of the dress.
The couple shared a special moment before the ceremony when Sulewski video-called Eilish during her final fitting at the Oscar de la Renta boutique in Beverly Hills. Eilish’s reaction was filled with enthusiasm as she complimented her soon-to-be sister-in-law, exclaiming, “My God, I can’t believe it. You look like an angel. Love you so much!” This exchange exemplified the affection and support within their family.
Finneas O’Connell and Claudia Sulewski announced their engagement in September 2024, after dating for seven years. The couple revealed their romantic proposal through Instagram, expressing their love with the caption “forever and ever 9.22.” Their relationship has always been a source of joy and inspiration, culminating in their joyous wedding day.
Billie Eilish’s role as officiant is a reflection of the deep bond she shares with her brother. The siblings have been integral to each other’s careers and lives, with O’Connell contributing as a co-writer and producer for much of Eilish’s music. Throughout her rise to fame, Eilish has often praised her brother for his unwavering support. In her acceptance speech for Variety’s Hitmaker of the Year award in 2019, she referred to O’Connell as her “best friend,” highlighting their collaborative journey in music that began when she was just a teenager.
Eilish has openly discussed how O’Connell has been her rock, with a bond that transcends mere familial ties. He has been a constant figure, one whom she feels entirely comfortable confiding in. In a previous interview, Eilish described him as “the one person that I feel like I can say absolutely anything to,” saying that their relationship provided her with a sense of security and love.
O’Connell has reciprocated this affection in public, expressing pride in their musical collaborations. During one of Eilish’s award show appearances, he shared, “I couldn’t be more proud of every song” that they have created together. His heartfelt declaration that he simply wants to be known as “Billie Eilish’s brother” underscores the profound respect and admiration woven into their relationship.
As the couple embarks on their new journey together, it is clear that their union is celebrated not only by their immediate family but also by a wide circle of friends and supporters. The wedding marks a significant milestone in their lives, filled with love and shared memories, further solidifying the connections that matter most to them.
The ceremony not only celebrated the love between Finneas O’Connell and Claudia Sulewski but also served as a poignant reminder of the importance of family and friendship. As they move forward into their shared future, the support of loved ones like Billie Eilish undoubtedly adds a beautiful layer to their story.