Billie Eilish officiates brother Finneas O'Connell's wedding to Claudia Sulewski in California

The singer took on the role of officiant at the intimate ceremony held this Saturday (30), which brought together family and famous friends in the American state.

Saturday was a day of celebration for the O'Connell family. Acclaimed music producer, singer-songwriter Finneas and actress-entrepreneur Claudia Sulewski tied the knot in an intimate ceremony held in California. The event brought together only family and a close circle of friends, featuring a special surprise that thrilled pop music fans: Billie Eilish was the one responsible for officiating her brother's wedding.

For the special occasion, the Hit Me Hard and Soft singer chose an elegant olive-green fitted dress with an off-the-shoulder neckline. The artist attended the event accompanied by her boyfriend, actor Nat Wolff. Another cute highlight of the celebration was the couple's pet dogs, Moose and Peaches, who actively participated in this very important moment in their owners' lives.

The guest list featured several major names from the entertainment and social media industries. Among those present were Justin and Hailey Bieber, actress Nina Dobrev, influencer Emma Chamberlain, Kristen Bell, Devon Lee Carlson, and singer Rebecca Black, who supported the couple amidst a private and sophisticated atmosphere.

Fashion also shone brightly during the celebration. According to international press reports, the bride chose to create memorable moments through different outfits throughout the day, showcasing creations by the Oscar de la Renta fashion house, including the classic main gown with a structured skirt and a long train for the exchange of vows.

The love story between Finneas and Claudia began in September 2018, after the couple connected through a dating app. After seven years of partnership, their engagement took place in September 2025 during a romantic sunset helicopter ride, culminating in the union celebrated this weekend under the blessings of his sister and long-time music partner.