Khloe posted the sweet photo booth pics on Snapchat on Wednesday, sharing the adorable black-and-white shots with her followers.
In one pic, North posed solo with Thompson and the two rocked giant grins. Then Khloe got in on the fun, cuddling up to her niece as Thompson gave Nori a little kiss on the cheek.
Khloe also posed with her momager, Kris Jenner, and her friends at the bash.
The patriotic event included a giant water slide, gold-covered desserts, and a signature Kardashian photo booth.