After already postponing once, Mariah Carey has now cancelled her New Zealand tour dates due to "a scheduling conflict".

The pop diva was supposed to play Auckland's Spark Arena on October 7, but promoters MJR Presents have now announced both her NZ and Aussie dates have been axed.

This comes after Carey was originally supposed to tour in February, but pushed back to August so she could embark on a "much bigger" world tour.

In a statement, Carey says: "It is with much regret that I am unable to visit Australia and New Zealand later this year, however I promise to find new dates soon.

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"I've been working away on new music and I cannot wait to share it with you later this year."

MJR says they are "disappointed" in the cancellation and full refunds will be given to all ticket holders from their original point of purchase.

"We apologise for the inconvenience to fans and ticket holders."

All current ticket holders will receive an email from their ticket provider confirming a full refund. See mjrpresents.com for more information.