Billie Eilish took on the most important role of her brother’s special day. The Grammy-winning singer officially officiated the wedding of her brother, Finneas O’Connell, and his longtime girlfriend, Claudia Sulewski. The intimate California ceremony on Saturday, August 29, 2026, was a family affair, with Eilish standing between the couple as they exchanged vows.
Billie Eilish Officiated Finneas and Claudia Sulewski’s Wedding
The “Birds of a Feather” singer, 24, performed the wedding ceremony for her older brother, 29, and his bride at the beautiful San Ysidro Ranch in Montecito, California. For the occasion, Eilish wore a sage green, off-the-shoulder gown with draping at the waist, turning heads with her elegant yet simple look.
In photos shared from the outdoor nuptials, Eilish can be seen smiling as she officially married the couple. At one point during the ceremony, the singer was seen wiping at her eyes while her brother read his vows before laughing wholeheartedly. The couple also included their beloved dogs, Peaches and Moose, in the celebration.
Finneas and Claudia Sulewski Get Married in California
Finneas O’Connell and Claudia Sulewski tied the knot on Saturday, August 29, at the San Ysidro Ranch in Montecito, a popular wedding destination for celebrities. The couple, who announced their engagement in September 2025 after seven years of dating, celebrated with an intimate outdoor ceremony attended by close family and friends.
Finneas opted for a classic black tuxedo for the occasion, while Sulewski, a host, actress, and founder of CYKLAR Skincare, stunned in multiple bridal looks. According to Vogue, she wore four custom Oscar de la Renta dresses over the wedding weekend, including outfits for the rehearsal dinner, ceremony, reception, and after-party. Her ceremony gown was an ivory silk faille ball gown with a drop-waist bodice and a structured, pleated skirt, topped with an asymmetric scarf neckpiece that flowed down the length of the train.
Billie Eilish’s Emotional Role
Eilish’s involvement in the wedding went beyond just officiating. She joined Sulewski virtually during her final dress fitting at Oscar de la Renta’s Beverly Hills boutique. When she saw her future sister-in-law in the gown, Eilish exclaimed, “My God, I can’t believe it. You look like an angel. Love you so much!” The singer’s boyfriend, Nat Wolff, was also among the guests at the celebration.
Celebrity Guests at the Wedding
The star-studded guest list included several of the couple’s famous friends. Among those in attendance were Justin and Hailey Bieber, Kristen Bell and Dax Shepard, Jason Sudeikis, Nina Dobrev, Emma Chamberlain, Rachel Sennott, Stassie Karanikolaou, Rebecca Black, Devon Lee Carlson, and Jesse Jo Stark. The couple’s parents, Maggie Baird and Patrick O’Connell, were also present.
How Long Have Finneas and Claudia Sulewski Been Together?
Finneas and Sulewski met on a dating app in 2018 and quickly formed a deep connection. The relationship became so meaningful to Finneas that he wrote a song about her just hours after their first meeting. The couple announced their engagement in September 2025, with Sulewski sharing photos of the romantic proposal on Instagram with the caption, “forever and ever 9.22.”
Frequently Asked Questions
1. Who is Finneas married to?
Finneas O’Connell is married to Claudia Sulewski, an actress, YouTuber, and founder of CYKLAR Skincare.
2. Did Billie Eilish officiate Finneas’ wedding?
Yes, Billie Eilish served as the officiant for her brother Finneas’ wedding to Claudia Sulewski on August 29, 2026.
3. Who is Claudia Sulewski?
Claudia Sulewski is an actress, content creator, and entrepreneur who founded the body-care brand CYKLAR.
4. When did Finneas and Claudia Sulewski get married?
The couple tied the knot on Saturday, August 29, 2026.
5. Where did Finneas and Claudia Sulewski get married?
The wedding took place at the San Ysidro Ranch in Montecito, California.
6. Was Billie Eilish at the wedding?
Yes, Billie Eilish was not only present but served as the officiant for the ceremony.
7. Who attended Finneas and Claudia Sulewski’s wedding?
The guest list included Justin and Hailey Bieber, Kristen Bell, Dax Shepard, Jason Sudeikis, Emma Chamberlain, Rachel Sennott, and others.
8. Are Finneas and Billie Eilish siblings?
Yes, Finneas is Billie Eilish’s older brother, and they have a close sibling bond both personally and professionally.
9. How did Billie Eilish become the wedding officiant?
Eilish was chosen by her brother and his wife to perform the ceremony, a fitting role given their close relationship.
10. Are wedding photos from Finneas and Claudia Sulewski publicly available?
Yes, photos from the outdoor ceremony have been shared publicly, showing Eilish officiating the wedding.
Billie Eilish’s role as officiant at her brother Finneas’ wedding to Claudia Sulewski made the celebration an especially memorable and meaningful occasion. The event highlighted the close bond between the siblings, both as family and as longtime musical collaborators. The intimate Montecito ceremony brought together a star-studded guest list to celebrate the couple’s love story, which began in 2018 and culminated in a beautiful California wedding.