Officiating as Rabbi: Billie Eilish married her brother Finneas and his fiancée in front of famous guests

Eight years after they first met on a dating app, music producer and Billie Eilish's older brother, Finneas O'Connell, married his partner Claudia Sulewski in Montecito, California. The famous sister served as the rabbi, marrying the couple in front of guests as well-known as herself.

The event, which took place this past weekend as a Saturday afternoon wedding, included sparkling guests such as Justin and Hailey Bieber — who arrived in a tight green dress that caused fans on social media to speculate that the two are expecting again. Also present were Nina Dobrev, Kristen Bell, Jason Sudeikis, Emma Chamberlain, and Eilish's partner of Jewish descent, actor and musician Nat Wolff. Bieber also shared on his Instagram account footage of himself and his model wife, who was holding a cocktail — who knows if it was non-alcoholic.

30-year-old Sulewski, who was glowing, wore four looks for the wedding weekend celebrations, designed by Oscar de la Renta: one for the rehearsal dinner, one for the wedding ceremony, a dress for the first dance and reception, and another dress for the after-party.

About a year after they first met, 29-year-old Finneas said that he wrote his song 'Claudia' hours after meeting the woman who is now his wife, and that he even sent her parts of the song on the very first night they met — it was not the first one he wrote about her.

In September 2025, Finneas pulled out a ring at sunset, and the two announced the move in an Instagram post: 'Forever and ever', which has now arrived. He told Jimmy Fallon about that proposal shortly after:

'I was nervous and also not. Everything went well and I felt happy, but before that there were so many things I wanted to turn out exactly right. For a few months I just lay awake at night, so it was a very big sigh of relief when everything worked out.'