Kanye West and Kim Kardashian are preparing to welcome a son into their growing family.

The celebrity couple had kept the sex of their second child a closely guarded secret, until Kardashian let the news slip in a Father’s Day Instagram post.

She published a picture of Kanye with her first-born, a daughter named North West, with the comment: “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!”

Kanye was asked about the gender of his next child in an interview with Hot 97 earlier this month and he point-blank refused to share it. He’s also steadfastly refused to share the release date for his forthcoming album release, Swish.

The rapper’s wife had announced her pregnancy during the (May 31) midseason finale of Keeping Up With the Kardashians, In a clip teasing scenes for the second half of season 10, Kardashian told her family, “I just got the blood test back and I am pregnant!”