Charli XCX wants to write for Justin Bieber.

Charli XCX

Charli XCX

The 'Boom Clap' hitmaker has penned songs for stars including Gwen Stefani and Iggy Azalea, but admitted the 21-year-old singer is at the top of her list for artists she wants to write for because she thinks he's "really, really great".

She said: "I like Justin Bieber as a pop star. I think he's really, really great. I really love the song 'Baby.' I think it's awesome.

"I would love to. I've never written for a boy before. I don't even know what I would say, but who knows?"

However, the 22-year-old star - who recently released her second studio album 'Sucker' - confessed she had a bit of a break from songwriting due to a creative block in April, but is now keen to get back into the studio to make music for herself and other acts before she embarks on a US tour with Jack Antonoff in July.

Speaking to Billboard at the MGM Grand Garden Arena in Las Vegas where she was attending the Billboard Music Awards, she said: "Last month I had a bit of a breakdown because I was feeling like I couldn't be creative enough so I've booked a load of studio time and I'm gonna be writing for myself, for my new project, and some other artists too. I can't say who. But yeah, there's songwriting going on right now."

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