Joel Little is celebrating a "crazy" achievement - and he says he had no idea it had happened.

The Kiwi producer, known for helming Lorde's debut Pure Heroine, has worked on three different albums sitting in the top 15 on the Billboard 200 charts this week.

They include Imagine Dragons' new album Evolve, Khalid's American Dream, and Lorde's second album Melodrama.

Little, who is based in Los Angeles, was notified of the news by his manager Ashley Page on Twitter.

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He quickly replied, calling it "crazy" and saying he "did not know that this was the case".

Little is behind six tracks across the three albums, The Industry Observer reported: one from Imagine Dragons, two for Lorde, and three for Khalid.

Page told the Industry Observer Little was "very particular" about who he worked with.

"There have been plenty of times we've turned down big artists because it hasn't been right for Joel," Page said.

"People really love working with Joel as he listens to their ideas first and foremost, and tries to work out how he can complement the artist's vision."

Imagine Dragons are at No. 3, Lorde at No. 12, and Khalid at No. 13.