After they shared pictures on Instagram, it's clear the Kardashian family spared no expense for the little girl as they put on a festival based on trendy art-and-music extravaganza Coachella.
Activities included everything from face painting and hair-braiding to temporary tattoos and fairground rides.
Guests were able to hang out in tepees at Kourtney Kardashian's home in Calabasas, California, while a Ferris wheel was set up for everyone to enjoy.
There were also small stalls, picnic benches, stages and a bouncy castle at the party.
Kim recently opened up about her parenting, admitting she is "strict" with North but still manages to be "fun and playful" at the same time.
She previously said: "I am a strict mother. I'm really fun and playful, but I'm really strict on nap time, and sleeping in her own crib.
"Like Kourtney's style is where her kids sleep in bed with her, so especially with the third baby coming - they're going to need a bigger bed or they're going to need some other rules.
"And maybe on weekends, [North will] come and sleep in the bed with us. But ... I'm not crazy strict."