Billie Eilish and Rosalía released their exciting collaboration this week and now she’s revealed her entire family helped write the lyrics.

The pop superstars have joined together for the hugely anticipated Spanish-language single ‘Lo Vas a Olvidar’.

As per Billboard, Eilish popped by Zane Lowe’s Apple Music show on Thursday, January 21st to reveal the inside details of how the song came to be and casually mentioned that the entire Eilish clan were involved in the songwriting process.

Clearly mum Maggie Baird and dad Patrick O’Connell have grown jealous of seeing Billie and her brother Finneas getting all the fame and plaudits and wanted in on the action.

“So my mom, my dad, Finneas, me, Finneas’ girlfriend Claudia, we all came down to the studio, and we listened, and me and Finneas were like, ‘Should we just write this line right now?'” Eilish explained to Lowe.

“So I was sitting in the room with my entire family. We both, all of us, including my dad and my mom, they were like, ‘What if it was like….’ We were all giving ideas. So technically they should have a writing credit, because we all wrote that line right at the end.”

The line in question is “You say it to me like it’s something I have any choice in/ If I wasn’t important, then why would you waste all your poison?”

‘Lo Vas a Olvidar’ had actually been in the works since all the way back in January 2019 but was only finally finished last year during lockdown.

That final line may be in English but Eilish convinced Rosalía to write and record the full song in Spanish.

“I remember when we were writing the song, I remember her saying something about, ‘It should be in English.’ And I was like, ‘No, no, no. It should be in Spanish. It’s so beautiful.’ And I’ve always loved music that isn’t in English,” she said.

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“I like tons of music from languages I don’t even speak. … I’ve been really intrigued by it pretty much my whole life. There’s so many Russian songs I like, and Spanish, and French.”

Check out ‘Lo Vas A Olvidar’: