Charli XCX says collaborating with Gwen Stefani has been like a "dream".

The British singer and songwriter has been helping out the US star as she prepares to release her next album.

Speaking to the Official Charts Company, the 'Sucker' star suggested that writing for Stefani is a career high.

She said: "I’ve actually been really lucky to be working on some stuff for Gwen Stefani behind the scenes, which is kind of a dream because she’s so badass!

"Aside from that I think most of my dream collaborators are dead actually - Lou Reed, Marc Bolan...people like that."

When asked if there any chart songs out just now she wishes she had written, Charli XCX replied:

"I love FourFiveSeconds, I think that song is amazing and really beautiful - it’s a really cool direction for Rihanna."

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Watch Charli XCX being interviewed below: