Dua Lipa has revealed that she "couldn't believe" Gwen Stefani agreed to sing on Mark Ronson's 'Physical' remix. The 25-year-old star released her Club Future Nostalgia remix album in August last year, featuring twists on her original Future Nostalgia tracks, and Stefani made a guest appearance.

Speaking to Zane Lowe during an Apple Music interview this week on February 23 (listen to the full interview below), Lipa admitted: "Honestly, I couldn't believe it. I couldn't believe it.

"I sat by my phone and I was literally holding my face pretty much. I was like, 'Oh my God, this is crazy. This is crazy.' I was just pacing around the room. Yeah, like, 'I've got it!'"

She explained how the collaboration came together, with her team initially contacting the No Doubt legend to "clear the sample" to use 'Hollaback Girl' on the LP.

She added: "The way it happened was so cool because we basically contacted Gwen and her team to try and clear the sample for 'Hollaback Girl' for Club Future Nostalgia.

"And I was like, 'Maybe we should just ask, put a feeler out, see if she wants to do something.' And she loved Mark Ronson's remix of 'Physical'.

"And she was like, 'I'd love to jump on this'. I'm like, 'Hell yeah, let's go. This is surreal'. It was just so exciting."

At the time Stefani said about the collaboration: "I was so excited when Dua reached out about teaming up with Mark Ronson and her for the “Physical” remix. “Club Future Nostalgia” is an epic dance party and I’m thrilled to be a part of it."

Ronson added: "I really don't do remixes much but Dua is my homegirl. I really wanted to make it special for her and also bring something totally new to the song. I basically wanted it to be as good as hearing a brand new song. And then when I heard Gwen's vocal... I mean, she has such an iconic tone, I was over the moon. It felt so good."

Lipa loved working on the remix record, and she noted the impact of the coronavirus pandemic when it came to getting everyone on board. She said: "It was such an exciting period, especially because it was that period of lockdown and the whole project came together because of everyone being at home.

"But it just made lockdown so exciting. I was just dancing around the house, listening to songs that I guess I've known for so long, that felt so new.

"So I was really just rediscovering the music in itself in a different way."

Reflecting on her Grammy-nominated sophomore album a year later, Lipa explained: "There were songs that I wrote because I wanted to feel a certain type of way, or there were songs that I put certain lyrics or certain feelings in that I was like, 'I want to be able to listen to this song and feel that way, that necessarily I wasn't always feeling."

Listen/stream Dua Lipa.