Kim Kardashian and Kanye West divorce. (Courtesy)

Kim Kardashian and Kanye West's divorce papers have revealed the reason why they have split.

The Keeping Up with the Kardashians star, 40, cited "irreconcilable differences" as her reason when she filed for divorce from the rapper, who she married back in 2014, earlier this month.

The couple got married in 2014. (Courtesy)

Her filing, which was seen by The Sun, also confirms reports that she is seeking joint custody of the couple's four children North, seven, Saint, five, Chicago, three and one-year-old Psalm.

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She has also requested that the ability to award spousal support by either herself or Kanye, 43, be terminated when the divorce is finalised.

Kanye is said by those in the know to be happy with the arrangement. Neither party is contesting the prenup that they had in place, it's been reported.

The former couple are already far along in reaching a property settlement agreement, it's claimed. Their divorce is said to be amicable.

Kim Kardashian and Kanye West.

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"There is no drama between Kim and Kanye," a source told People.

"Kim is mostly just disappointed that they couldn't figure out how to stay married. But it takes two people to create a happy marriage.

“Kim has felt Kanye is not willing to do the hard work and compromise."