Billie Eilish officiates brother Finneas O’Connell’s wedding

Billie Eilish officiates brother Finneas O’Connell’s intimate Santa Barbara wedding to Claudia Sulewski.

Billie Eilish took on a special role at her brother Finneas O’Connell’s wedding to longtime girlfriend Claudia Sulewski, officiating the couple’s intimate ceremony in Santa Barbara on Saturday.

Finneas, 29, married Sulewski, 30, on August 29 at the picturesque San Ysidro Ranch in an outdoor ceremony attended by close family members, friends and the couple’s dogs, Peaches and Moose.

The 24-year-old BIRDS OF A FEATHER singer added a personal touch to the celebration by serving as the wedding officiant.

Billie Eilish officiates intimate ceremony

Photos shared online showed Eilish standing alongside the newlyweds as she carried out her duties during the ceremony.

The singer also mingled with guests throughout the celebrations and was seen chatting with Hailey Bieber and other attendees.

For the occasion, Eilish wore a metallic olive-green, off-the-shoulder full-length gown. The figure-hugging dress featured a draped, ruched bodice and defined waist.

Her role as officiant added a memorable family element to the wedding, which brought together the couple’s closest friends and relatives.

Claudia Sulewski wears four Oscar de la Renta looks

Sulewski made several fashion statements throughout her wedding weekend, wearing four Oscar de la Renta looks.

According to Vogue, the bride selected separate designs for the rehearsal dinner, ceremony, first dance and reception, and after-party.

Finneas opted for a classic look on his wedding day, wearing a traditional tuxedo for the ceremony.

Celebrity guests attend wedding

The intimate celebration attracted several high-profile personalities from Hollywood, music and social media.

Guests reportedly included Nina Dobrev, Dax Shepard, Kristen Bell, Emma Chamberlain, Rachel Sennott, Stassie Karanikolaou, Jason Sudeikis and Carter Gregory.

Eilish’s boyfriend Nat Wolff also attended, while singer Justin Bieber, whom Eilish has previously described as a childhood crush, was among the guests.

The wedding marked a private celebration of Finneas and Sulewski’s relationship, with the couple surrounded by family, friends and celebrity guests.

Eilish’s role as the wedding officiant made the occasion particularly special, highlighting the close bond between the siblings beyond their successful musical partnership.