Eilish was unveiled as the artist behind the new Bond song at the beginning of this year, when it was announced that she and her brother Finneas O'Connell would be writing and recording the new track together.
Quoted in a tweet released by the official James Bond Twitter account, 18-year-old Eilish said: "It feels crazy to be a part of this in every way. To be able to score the theme song to a film that is part of such a legendary series is a huge honour.
"James Bond is the coolest film franchise ever to exist. I'm still in shock."
"It feels crazy to be a part of this in every way. To be able to score the theme song to a film that is part of such a legendary series is a huge honour. James Bond is the coolest film franchise ever to exist. I'm still in shock," Billie Eilish #NoTimeToDie https://t.co/g6A1w8i10s
- James Bond (@007) January 14, 2020
The franchise also said Eilish's forthcoming 007 theme would make her the 'youngest artist in history to write and record a James Bond theme song' - not bad for someone who's also just become the youngest person (and first woman, we should add) to win all four of the main Grammy categories, having scooped Best New Artist, Record of the Year, Song of the Year and Album of the Year at the 2020 ceremony.
The new Bond tune - also called No Time to Die - was teased yesterday with a short 13-second preview.
The theme song for the 25th @007 film, written and performed by Billie, is titled "No Time To Die" and will be released globally tomorrow at 4pm PT. #NoTimeToDie pic.twitter.com/5QU9a3FPM0
- billie eilish (@billieeilish) February 12, 2020
Despite the fact it was just a small taster of the track, it proved to be an immediate hit with fans, with one writing: "This gives me so many chills."
Another wrote: "Holy effin s**tttt!!!!! Sounds dope."
A third said: "Well, I love those 13 seconds, beautiful."
The film, which is set for an April 2020 release, will mark Daniel Craig's fifth time playing the iconic spy.
As for what's in store for him this time round, the synopsis explains: "Bond has left active service and is enjoying a tranquil life in Jamaica. His peace is short-lived when his old friend Felix Leiter from the CIA turns up asking for help.
"The mission to rescue a kidnapped scientist turns out to be far more treacherous than expected, leading Bond onto the trail of a mysterious villain armed with dangerous new technology."
We'll also see Rami Malek introduced as new villain Safin, joined by other newcomers like Knives Out star Ana de Armas and Captain Marvel's Lashana Lynch.
They'll all be joined by familiar faces reprising their roles, such as Ralph Fiennes as M, Naomie Harris as Moneypenny, Ben Whishaw as Q, Léa Seydoux as Madeleine Swann, Jeffrey Wright as Felix Leiter and Christoph Waltz as Ernst Stavro Blofeld.
No Time To Die will be released in the UK on 2 April 2020 and 8 April 2020 in the US.