Finneas O’Connell and Claudia Sulewski have officially tied the knot! O’Connell, a musician, producer and Billie Eilish‘s brother, and Sulewski, a YouTuber, actress and founder of Cyklar skincare, got married on Saturday in Montecito, California, surrounded by family and friends, according to Vogue. The Grammy and Oscar winner knew something was special about Sulewski from the moment they first met on a dating app in 2018. He previously told BuzzFeed that he wrote his song “Claudia” on the first night they spent together. The singer also wrote his 2022 song “Mona Lisa, Mona Lisa” about Sulewski. After years together, they got engaged in…