Reality TV star Kim Kardashian has revealed that she is pregnant with a son.

On Sunday, Kim posted on image-sharing website Instagram a photograph of her husband Kanye West reading to their daughter North West, reports aceshowbiz.com.

A message with the image read: "Precious moments like this when we were traveling on tour with you are what I live for. You're such a good daddy to North & you will be the best daddy to our new son too."

Earlier this month, Kim had denied having a son after a friend revealed the sex of their baby.