Billie Eilish's brother Finneas O'Connell marries Claudia Sulewski after 7 years together
MONTECITO, CALIFORNIA: Finneas O'Connell is officially off the market! The music producer tied the knot with his longtime girlfriend, Claudia Sulewski, on Saturday, August 29. The music producer and brother of Billie Eilish couldn’t hold back their smiles as they exchanged vows during their low-key, private wedding ceremony.
O'Connell and Sulewski announced their engagement in an Instagram post on September 24, 2025, after dating for seven years. The couple first began dating in September 2018 and finally said, "I do" in 2026.
For those unaware, the Grammy-winning artist rose to fame as a producer and songwriter, working with major artists such as Selena Gomez, Halsey, Justin Bieber, and Camila Cabello.
Finneas O'Connell marries Claudia Sulewski in private wedding ceremony
Surrounded by family and close friends from the entertainment fraternity, O'Connell and Sulewski celebrated their special day in a cozy and low-key ceremony.
O'Connell kept his wedding look classic, opting for a timeless black tuxedo. Sulewski, meanwhile, embraced multiple bridal looks throughout the wedding weekend, all designed by Oscar de la Renta.
According to Vogue, the bride wore four different looks, including outfits for the rehearsal dinner, ceremony, first dance and reception, and after-party.
For the ceremony, Sulewski wore an ivory silk faille ballgown featuring a drop-waist bodice and a structured, pleated skirt. The elegant look was finished with an asymmetric, draped and pleated scarf neckpiece that flowed down the full length of the train.
Reflecting on the moment she tried on the gown, Sulewski told Vogue, "We were putting it on, and I was saying, there's something about this dress that just demands a moment of silence.”
Finneas O'Connell called Claudia Sulewski the 'light of my life'
On Sulewski's birthday, O'Connell shared a heartfelt post celebrating her and called her the "light of my life." O'Connell wished his longtime girlfriend a happy birthday, writing, "I thank my lucky stars you were born!"
"Watching the fruits of your meticulous labor take shape over this past year has been so dreamy and inspiring- can't wait to spend another year cheering you on," he added.
Sulewski once again served as a muse for O'Connell's song 'Mona Lisa, Mona Lisa' in 2022. She starred in and directed the music video for the song.
Finneas O'Connell and Claudia Sulewski announced their engagement in 2025
In September 2025, O'Connell popped the question during a romantic sunset proposal with a cushion-cut diamond engagement ring. The couple announced their engagement in a joint post, captioning it, "Forever and ever 9.22."
Days after their engagement, O'Connell appeared on 'The Tonight Show Starring Jimmy Fallon', where he opened up about keeping the proposal a secret.
"I mean, I'm very relieved that it happened," he said. "I feel like it really taught me that I'm not cut out to rob banks or steal cars or something because I was keeping a joyous, happy secret for several weeks, and it ate me alive.”
