Billie Eilish officiates brother Finneas’ star-studded wedding to Claudia Sulewski

Billie Eilish officiated her brother Finneas’ star-studded wedding to Claudia Sulewski on Saturday.

The “Birds of a Feather” singer, 24, wore an olive-green dress as she stood between the bride and groom at San Ysidro Ranch in Santa Barbara, California, per photos obtained by Page Six.

At one point, she was seen wiping at her eyes while her brother read his vows, before laughing wholeheartedly.

For their special day, Finneas wore a classic black suit, while Sulewski stunned in an Oscar de la Renta dress.

During the outdoor ceremony, the couple said their “I do’s” in front of Justin and Hailey Bieber, Dax Shepard and Kristen Bell, Nina Dobrev, Emma Chamberlain, Jason Sudeikis, Carter Gregory, Stassie Karanikolaou and Rachel Sennot.

Eilish’s boyfriend, Nat Wolff, also made an appearance.

Sulewski, who started dating Finneas in 2018 after meeting on a dating app, told Vogue that she wore four Oscar de la Renta dresses at her wedding, with her favorite look being her off-the-shoulder ceremony ball gown with a drop-waist bodice.

“We were putting it on, and I was saying, there’s something about this dress that just demands a moment of silence,” the 30-year-old told Vogue in a final dress fitting ahead of the wedding.

Eilish attended the dress fitting virtually, gushing over her now-sister-in-law during a FaceTime call.

“My God, I can’t believe it,” the Grammy winner said, per Vogue. “You look like an angel. Sorry to be interrupting. Love you so much.”

Eilish officiating her brother’s wedding seemed fitting due to the close bond they share, with him serving as her co-writer and producer on all her projects.

However, after Finneas didn’t join his sister on her 2024-2025 “Hit Me Hard and Soft” Tour, Eilish spoke out against the rumors that the siblings had a falling out.

“It was a few years in the making,” she told Elle in April. “We got so busy that we would only see each other right before going on stage.”

“Finneas and Andrew [Marshall, her touring drummer], who were the only band members I had back in the day, performed on some sort of platform that was hard to leave,” she continued. “Finneas was stuck in a tower—like Rapunzel!”

Eilish added of Finneas, “He never said it, but I was feeling like, ‘You have more to be doing than being my band member in the back.’”

Finneas, for his part, told Elle that he agreed to skip her tour, saying, “It’s basically true that I don’t like touring, but I love the show part of it.”

“And I love being around Billie,” the 29-year-old added. “This past year, when she would be on tour for months, I missed her a lot.”

Back in 2020, Finneas told the Washington Post that he’s grateful for his professional relationship with his sister.

“In the alternate reality where I wasn’t involved at all, and I’d been like, just, sweating my way through, trying to have a music career for years? And then my sibling had one and I wasn’t involved at all? I think I’d be very tortured by it,” Finneas said.

“But the fact that we’ve had one in tandem makes a lot of sense.”