In one snap, North and Penelope can be seen wearing matching robes, with North sporting a headband with a purple unicorn horn.
Ah, the Kardashians seriously know how to throw a whopper of a party no matter what age.
In Instagram, Kim posted stories with tables full of cakes-edinoroga and a video of the cakes, festive décor, a pool with an inflatable rainbows and clouds, even the live pony in the role of the unicorns.
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The make-up entrepreneur brought along four-month-old daughter, Stormi Webster, who she shares with boyfriend Travis Scott.
And this isn't the time the 20-year-old has flaunted her baby girl's designer gear, as she previously stepped out with a Fendi pram.
When you're a child in the Kardashian party, your celebrations are super-sized - fantasy environments come to real life. A 10-year-old DJ spinning tunes.
North and Penelope's joint birthday celebration is shaping as much as be an annual Kardashian custom.