Finneas and Claudia Sulewski Marry in Montecito With Billie Eilish Officiating

Music producer Finneas married longtime girlfriend Claudia Sulewski in an outdoor ceremony in Montecito, California, according to reports published by People and Harper’s Bazaar. The couple tied the knot during a lush coastal gathering where the groom’s younger sister, Billie Eilish, officiated the proceedings, as confirmed by photos published by TMZ.

The wedding brought together a notable guest list featuring Justin and Hailey Bieber, Rachel Sennott, Jason Sudeikis, Kristen Bell, Dax Shepard, and Emma Chamberlain, alongside Eilish’s boyfriend, Nat Wolff, according to reporting by Harper’s Bazaar. Finneas and Sulewski first met through a dating app in 2018 and announced their engagement in September 2025.

Fashion Details and Custom Oscar de la Renta Looks

For the multi-day celebration, Sulewski wore four distinct custom looks designed by Oscar de la Renta, according to Vogue. To walk down the aisle, the beauty content creator and Cyklar skincare brand founder chose a strapless drop-waist ball gown accented with a neck scarf, as detailed by Harper’s Bazaar.

Future Plans Discussed Ahead of the Ceremony

In interviews leading up to the celebration, Sulewski spoke about balancing extensive wedding preparations with her everyday routines. I’ve been so busy planning a wedding and its surrounding events this year that I’ve really been off my reading game, which I hate to admit, but it’s true! she told Harper’s Bazaar.

Looking toward the future, Sulewski also shared insight into her current areas of personal research. My current podcast fixation is listening to shows or episodes about pregnancy, giving birth, and egg and sperm quality, she told Harper’s Bazaar. I’m fully diving into the research. I’m still far out from that chapter of my life, but I love learning about the human body and the different ways that we can optimize our health before taking that next step. Harper’s Bazaar