Kanye West and Kim Kardashian West married in 2014 and have three children. (Photo by Jordan Strauss/Invision/AP, File)

Kim Kardashian West has praised Kanye West as an "inspiration" in honour of their fourth wedding anniversary.

The 37-year-old reality star - who has four-year-old North, two-year-old Saint, and four-month-old Chicago with Kanye - married the rapper in May 2014, and on Thursday, she took to Instagram to post a heartfelt tribute to her spouse in honour of their anniversary.

Posting a picture of them from their wedding day, Kim wrote: "4 years down and forever to go.... Thank you babe for giving me our family and caring so much about us. Thank you for inspiring me on a daily, I'm so lucky. I can't wait for forever... Happy Anniversary (sic)"

The 'Keeping Up with the Kardashians' star posted the same message on her Twitter account.

As of the time of writing, Kanye, 40, is yet to wish his spouse a happy anniversary publicly, but he revealed earlier this month that he has discarded his phone in order to be able to focus on his music.

The couple's four-year anniversary comes after Kim revealed recently that she would be open to the idea of having a fourth child with the 'Heartless' rapper.

Kim and Kanye used a surrogate mother for their youngest daughter Chicago after Kim was advised against getting pregnant again, and the beauty "enjoyed" the surrogacy process so much she's considering using one again to have a fourth child.

She said: "I would have maybe one more [child]. I really, really enjoyed the surrogacy process. I will say, when it came to the breastfeeding time, I was like, 'Okay, this is the best decision I ever made.'

"It's a game changer, having to not go through [nursing] every few hours. I can spend so much more time with the older kids and getting them used to the baby."