Billie Eilish Officiates Brother Finneas O’Connell’s Wedding to Claudia Sulewski

Finneas O’Connell has married his longtime partner, Claudia Sulewski, after eight years together.

The singer, producer and brother of Billie Eilish tied the knot with Sulewski in Montecito, California, on Saturday, according to Vogue. Family and close friends attended the ceremony.

Eilish reportedly officiated the wedding. Photos shared by celebrity gossip account DeuxMoi showed her standing between O’Connell and Sulewski during the ceremony. Guests reportedly included Justin and Hailey Bieber, Kristen Bell, Nina Dobrev, Nat Wolff, Emma Chamberlain and Rachel Sennott.

Sulewski wore four Oscar de la Renta outfits throughout the celebrations. During her final dress fitting, she called Eilish to show her the ivory ceremony gown. Eilish responded, “You look like an angel.”

O’Connell and Sulewski met on a dating app in 2018. He wrote the first verses of his song “Claudia” on the day they met, later describing the relationship as something special from the beginning.

The couple bought their first home together in 2019. O’Connell also wrote “Mona Lisa, Mona Lisa” about Sulewski in 2022, with her appearing in the song’s music video.

They announced their engagement in September 2025 with an Instagram post captioned “forever and ever 9.22.” O’Connell later said the secret proposal was difficult to keep because he was so excited about it.