FINNEAS & CLAUDIA SULEWSKI TIE THE KNOT IN SANTA BARBARA Billie Eilish Officiates

Billie Eilish, Finneas and Claudia Sulewski

Finneas and Claudia Sulewski

Billie Eilish, Finneas and Claudia Sulewski

Finneas and Claudia Sulewski

Justin Bieber and Hailey Bieber

Kristen Bell and Dax Shepard

Nina Dobrev

Devon Lee Carlson and Anastasia Karanikolaou

Rebecca Black

Emma Chamberlain

Finneas O’Connell and Claudia Sulewski are officially married — and his superstar sister Billie Eilish had one very important job on their big day.

The Grammy-winning musician and producer and the actress/creator tied the knot in an intimate ceremony at the luxe San Ysidro Ranch in Santa Barbara, Calif. … surrounded by family, famous friends and even a couple of their four-legged favorites.

The guest list was stacked … Justin and Hailey Bieber, Rachel Sennott, Emma Chamberlain, Rebecca Black, Jason Sudeikis, Kristen Bell, Dax Shepard, Devon Lee Carlson, Stassie Karanikolaou, and more all turned out for the newlyweds.

Billie arrived with Nat Wolff, and the two stayed close throughout the festivities.

There was also a moment involving Justin and Hailey that caught some attention — the pair stepped away from the crowd for what appeared to be a serious, emotional conversation.

Justin later took a phone call, and Hailey walked back over to rejoin the party.

But the focus of the day was clearly Finneas and Claudia … who kept things romantic, personal and very much a family affair as they started their next chapter together.

Via: TMZ