The arrival of their fourth child, and second son, came shortly after Kourtney Kardashian announced on The Ellen DeGeneres Show the previous day that Kim and Kanye's surrogate had gone into labour - which was a complete shock to their mother, Kris Jenner, who was also a guest on the show that episode. Kim broke the news on social media, announcing on Twitter, "He's here and he's flawless!"
"He's also Chicago's twin lol I'm sure he will change a lot but now he looks just like her", she added.
The youngster joins sisters North, 5, and Chicago, 1, as well brother Saint, 3. In one of the videos shared by Kim herself, the mum-to-be had revealed that she was freaking out before the birth of her son.
Like third child Chicago, the new baby was delivered by a surrogate, after doctors warned the star further pregnancies could be risky after she battled with life-threatening condition placenta accreta during a previous pregnancy.
The jab was all in good fun but an insider revealed that Kendall does have some insecurities about the way she is seen in the family. She responded: "We all weigh in, I definitely take a family survey, but it's usually after the baby's born or I'm trying to figure out what the baby looks like".
"To my fantastic Mom MJ, I love you more than you will ever know".
Yesterday it was Mothers' Day.
Regardless - it's still nice that Kendall wished her grandma a happy mother's day, even if it was part of her playful revenge on her own mom.