Los Angeles, Aug. 31 -- Music producer Finneas O'Connell, the brother of singer Billie Eilish, has tied the knot with his longtime girlfriend, Claudia Sulewski, who is an actress and YouTuber.

The couple exchanged vows on August 30 in Montecito, California, Billboard reported, citing information from TMZ.

The wedding ceremony was officiated by Finneas' superstar sister and longtime musical collaborator, Billie Eilish. Their parents, Maggie Baird and Patrick O'Connell, were also present.

Among the famous guests were Justin and Hailey Bieber, Rachel Sennott, Emma Chamberlain, Rebecca Black, Jason Sudeikis, Kristen Bell, Dax Shepard, Devon Lee Carlson, Stassie Karanikolaou and Jesse Jo Stark.

Finneas and Claudia Sulewski announced their ...