Grammy-winning musician Finneas O'Connell married his longtime partner, host and beauty entrepreneur Claudia Sulewski, at the San Ysidro Ranch in Montecito, California, on Saturday, August 29.
His sister and close musical collaborator, singer Billie Eilish, officiated the wedding ceremony, according to People magazine. San Ysidro Ranch is a luxury resort in Montecito, a coastal community near Santa Barbara known for celebrity residences.
Eilish wore an off-the-shoulder maxi gown in a soft grey-green shade featuring draped waist details. She appeared emotional during the ceremony as her brother read his wedding vows to Sulewski. Eilish and O'Connell have worked together closely throughout her career, co-writing and producing many of her biggest hit records.

Celebrity guest list
The wedding took place in front of a star-studded crowd of celebrity friends. Among those in attendance were singer Justin Bieber and his wife Hailey Bieber, actors Kristen Bell and Dax Shepard, actress Nina Dobrev, and actor Jason Sudeikis.
Hailey Bieber wore a vintage lime green gown from the Versace archives for the ceremony, according to Page Six. Her husband, Justin Bieber, arrived in an oversized suit. Versace is an Italian luxury fashion house founded in 1978, known for its high-fashion designs and celebrity red carpet wear.
Bridal fashion by Oscar de la Renta
Sulewski wore four custom designs created by the fashion house Oscar de la Renta across the wedding festivities, as reported by Vogue magazine. Oscar de la Renta is a luxury fashion house based in New York, famed for eveningwear and bridal gowns.
Her main ceremony wedding gown was an ivory dress made from silk faille. The design featured a drop-waist corset, a pleated skirt, and an asymmetrical pleated scarf that started at her neck and extended along the full length of the train.
A few days before the ceremony, Sulewski held a video call with Eilish during her final dress fitting at the Oscar de la Renta boutique in Beverly Hills to reveal the gown. Seeing the dress for the first time, Eilish, a ten-time Grammy winner, expressed her amazement, telling Sulewski that she looked like an angel and that she loved her very much.
Proposal and relationship history
O'Connell and Sulewski announced their engagement last September. At the time, they shared photographs from the romantic proposal on Instagram with a caption reading forever 9.22.
The couple first met through a dating app in 2018. Their very first date immediately became a source of musical inspiration for O'Connell, who wrote his song titled Claudia right after meeting her. The couple continued their relationship and bought their first home together in 2019.
Speaking about their relationship on the Hot Smart Rich with Maggie Sellers Reum podcast, Sulewski recalled that they had fallen in love hard, fast, and honestly. She added that there were no games between them, that they were completely honest from their very first moment together, and that when someone feels that way, they simply know it.
