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On Sunday, the Kardashian/Jenner crew threw a big birthday bash for Kylie Jenner's boyfriend Tyga's son King Cairo's fourth birthday (whew, get all that?). The party had a Ferrari theme, probably because of Tyga's love of fancy cars (even though they keep almost getting repossessed), complete with a little race track. And because this is the Kardashians, there was also a trampoline, a ferris wheel, horses, and a big bouncy slide.

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Kylie thought this would be the perfect time to let her little niece, North West (the daughter of Kanye West and Kim Kardashian West) try out her famous lip kits.

North picked black for her lips, making her the look like the cutest, tiniest goth ever.

Meanwhile, another little girl at the party went the safer route and chose pink.

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Kylie captioned one of her pictures, "What happens at auntie Kylie's stays at auntie Kylie's," presumably because North's mom Kim might think a three-year-old is a little young for makeup. Most of the Kardashians/Jenners probably don't start wearing makeup until they're about five or six years old.

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This party came just one day after Cairo's mom (Rob Kardashian's fiancee and soon-to-be baby mama) Blac Chyna had one for him. The only Kardashian/Jenner to attend that party was Kris Jenner, because no one else in the family seems to be a big fan of Blac Chyna. Man, what a convoluted family this is turning into.