The song, which Eilish wrote with her brother, Finneas O’Connell, is the siblings’ second award in the category. By Matt Stevens Billie Eilish ... be kept in the background.

from "Barbie" picked up the trophy for Best Original Song, making 22-year-old Eilish and her 26-year-old brother Finneas the youngest — and second-youngest, respectively — to win two Oscars.