Grammy-winning producer and songwriter Finneas O’Connell has officially married his longtime partner, actress and entrepreneur Claudia Sulewski, in a picturesque ceremony held in Montecito, California.

The couple exchanged vows on Saturday, Aug. 29, surrounded by family, close friends and several well-known faces from the entertainment industry, marking the beginning of a new chapter after nearly eight years together.

Claudia Sulewski, 30, wore a series of custom Oscar de la Renta designs throughout the wedding festivities, including separate looks for the rehearsal dinner, ceremony, first dance, reception and after-party. The celebration blended classic elegance with personal touches that reflected the couple's long-standing relationship.

Finneas, 29, is widely recognized as the award-winning producer, songwriter and collaborator behind many of sister Billie Eilish’s biggest hits. Making the occasion even more meaningful, Billie Eilish officiated the ceremony, according to photos shared from the event.

Among the celebrity guests were Justin and Hailey Bieber, Nina Dobrev, Kristen Bell, Dax Shepard, Emma Chamberlain, Jason Sudeikis, Rachel Sennott, Stassie Karanikolaou, Carter Gregory and Nat Wolff, who joined family and friends in celebrating the newlyweds.

The couple's love story began in 2018 after meeting through a dating app. Their connection was immediate, inspiring Finneas to write the song "Claudia" just hours after they first met. Over the years, their relationship has continued to influence his music, with Sulewski also directing and starring in the video for his song "Mona Lisa, Mona Lisa."

In September 2025, Finneas proposed during a romantic sunset setting after seven years together. The engagement was announced with a heartfelt social media post simply captioned, "Forever and ever."

Following the proposal, the musician admitted that keeping the surprise a secret had been one of the most stressful experiences of his life, joking that the emotional pressure convinced him he would never be capable of living a life of crime because he struggled to hide such happy news.

As the couple planned their wedding, Finneas often said he wanted Claudia to take the lead in designing the celebration, explaining that his biggest goal was simply to see her happy on their special day.

Their wedding now marks another milestone in one of Hollywood's most admired long-term relationships, celebrating a partnership built on creativity, friendship and years of unwavering support for one another.