Charli XCX says she and Iggy Azalea wrote their hit song 'Fancy' in less than an hour.

The song reached No.1 in the US in 2014, but the Brit told People that the song was a quick write.

She said: "We wrote it in like half an hour.

"Iggy had like done her rap so I just came in the studio and put the chorus down so that was it, it was a really quick process."

The song meanwhile featured on Iggy Azalea's 2014 debut album 'The New Classic'.

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Watch the video for 'Fancy' below: