The celebration was dubbed 'Kidchella', a play on the annual Californian music festival Coachella, and featured a Ferris wheel, swimming pool and bouncy castle.
North was surrounded by her family on her special day, with grandmother Kris Jenner posting a picture of the party scene with caption: "View from the Ferris Wheel! #Norths1stBirthday #Kidchella."
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Kim's sisters were also in attendance with mum-to-be Kourtney Kardashian sharing a photo of the Ferris wheel on Instagram and Khloé uploading an image of herself sharing an ice cream with one of the youngsters.
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"Hitting up #Kidchella with my bestie Zeplin. 🎡🍧💋" Khloé wrote alongside the picture.
Given the party's festival theme, it was only appropriate that there was musical entertainment.
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Kris posted a video of Kylie and Kendall Jenner, Jaden Smith and actor Mateo Arias on a custom-made stage bearing the name 'Kidchella' as they danced along to songs including Kanye West's Good Life.