"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!" she shared on Sunday, next to a picture of Kanye West with his 2-year-old daughter North.
She also shared a picture of West kissing his beloved little girl.
"I'm so lucky to be married to a man who is so in love with his daughter, your bond is so irreplaceable! Thank you for being such a good dad! We love and appreciate you so much! We're so blessed to have you!"
The news of having a boy comes just a month after the news broke at the end of May, the couple were expecting yet again.