Billie Eilish Officiates Brother Finneas O'Connell’S Star-Studded Santa Barbara Wedding To Claudia Sulewski

Billie Eilish Takes Center Stage as Officiant

Finneas O'Connell and Claudia Sulewski have officially tied the knot, marking a major milestone in their eight-year relationship. The couple exchanged vows at the storied San Ysidro Ranch in Santa Barbara, California, on Saturday – an intimate, sun-soaked celebration that blended family warmth with celebrity polish.

Rather than just being a guest, Finneas' Grammy-winning sister Billie Eilish stood at the center of the ceremony as its officiant. Their parents, Maggie Baird and Patrick O'Connell, watched as the pair said their vows, and the couple's dogs, Peaches and Moose, were also included in the festivities.

“It felt like the whole family was glowing – intimate, joyful and a touch of Santa Barbara magic.”

Star-Studded Guest List

The weekend drew a who’s-who from entertainment and internet culture, keeping the mood upscale but relaxed in true Southern California style. Justin Bieber and Hailey Bieber were among the notable attendees, giving the celebration that red carpet energy while still feeling personal and close-knit.

Other guests included Rachel Sennott, Emma Chamberlain, Rebecca Black, Jason Sudeikis, Kristen Bell, Dax Shepard, Devon Lee Carlson and Stassie Karanikolaou. Eilish’s boyfriend, Nat Wolff, was also on hand to share the moment with the family.

Seen and Celebrated

The blend of longtime friends, creative collaborators and internet-native stars underscored the couple’s cross-generational connections – from mainstream pop names to digital creators who helped shape Claudia’s career. It was a guest list that read like a snapshot of contemporary celebrity culture, quietly anchored by family presence.

Claudia’s Fashion Moments – Four Oscar de la Renta Looks

Fashion was a focal point across the wedding weekend. Claudia Sulewski turned to Oscar de la Renta for her looks, changing through four distinct outfits created for the rehearsal dinner, ceremony, first dance, reception and after-party.

Vogue documented her final fitting ahead of the wedding, highlighting the thought and tailoring that went into each moment. From rehearsal dinner chic to reception glamour, the wardrobe choices gave the weekend a runway-meets-California-garden-party vibe.

Outfits for Every Moment

Sulewski’s four Oscar de la Renta ensembles were tailored to different moments in the celebration, ensuring each part of the weekend felt curated and special. The variety of looks underscored how fashion and personal expression played into the couple’s milestone.

The Relationship and Engagement

Finneas and Claudia’s romance dated back eight years, a long arc that culminated in an engagement announced in September 2025. The pair shared their engagement news with a joint Instagram post captioned "forever and ever 9.22," signalling their plans after seven years together.

After that chapter, the two have now officially begun married life with a ceremony that brought family front and center – and with Billie Eilish playing an unusually close role in the proceedings.

Family First

With parents watching and a sister officiating, the wedding leaned into intimacy rather than spectacle. The choice of San Ysidro Ranch added a timeless California backdrop – a setting known for peaceful gardens and discreet, upscale gatherings that suit both celebrity guests and quiet family moments.

As the newlyweds start their married life, the weekend felt like a West Coast celebration that married personal history with a touch of Hollywood flair – a perfect Santa Barbara ceremony to kick off a new chapter.