The news was official after a tweet Tuesday morning from the official 007 Twitter account. Eilish, who was all of five years old in 2006 when Daniel Craig took over 007 in Casino Royale, is also unique among previous pop stars who have attached their voices to Bond films, like Adele.
Eilish is the youngest to ever get the gig.
Uproxx quoted a statement from Eilish, who said that to "be able to score the theme song to a film that is part of such a legendary series is a huge honor."
Bond, said Eilish, "is the coolest film franchise ever to exist. I’m still in shock.”
Eilish's take on the oeuvre was composed with her brother Finneas O'Connell, with whom she created her Grammy-nominated debut album When We All Fall Asleep, Where Do We Go? last year.
"Writing the theme song for a Bond film is something we've been dreaming about doing our entire lives," he said.
"There is no more iconic pairing of music and cinema than the likes of Goldfinger and Live And Let Die. We feel so so lucky to play a small role in such a legendary franchise. Long live 007."
Bond songs tend to have a charmed existence, notes the BBC, as previous selections—Adele's "Skyfall" and "Writing's On The Wall," which Sam Smith recorded for Spectre—have both won Oscars.
This isn't the only major development regarding music for No Time To Die—in a post published Monday on the official Bond website producers Michael G. Wilson and Barbara Broccoli confirmed prolific film composer Hans Zimmer will score the movie as well.
Bond 25 will be Daniel Craig's final turn as 007. The film's plot reportedly sees the secret agent put retirement on hold after his friend from the CIA requests assistance. He ultimately confronts Rami Malek as Safin, an enemy unlike any he's encountered before.
No Time To Die hits theaters on April 8, 2020.