Kim, 36, sounded very excited as she typed her birthday wishes to her first born.
She wrote 'Happy birthday to my mini me! How good can an experience really be if you didn't get the shot though, am I right? She said: "My baby girl turned 4 years old today!" They've got you salivating over contouring, only to tell you that you need to get behind nontouring instead... and have you seen the new Lip Kit?
But it didn't seem to bother Kim, who has two children with husband rapper Kanye West, as she continued to tweet throughout the night about her new Kimoji merchandise.
While aunty Kourtney Kardashian uploaded an aww-inducing pic of North donning pink PJs with matching glasses while brushing her teeth. Nice to meet you, and this is Kanye.' And Kanye goes, 'Yeah, Dan didn't want you on the show.' She laughed-by the way, Kim Kardashian was lovely.
She paired the shirt with light gray Yeezy sweatpants and coordinating white sneakers. "I love you to the moon & back North", read her caption.
The stylish 4-year old wore a sparkly princess headband as she blew out four candles on a colourful, sprinkle-filled cake.
And naturally, it wouldn't be a Kardashian party without a little social media.
She wrote 'Happy birthday to our handsome, funny, smart little love bug, North. "I love you so much my precious angel girl.Lovey xo". Another added, "So we're just gonna pretend like it's not summer and she doesn't live in California!?"