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"What happens at Auntie Kylie's stays at Auntie Kylie's." Unless, of course, she puts it on Snapchat. 

Kylie Jenner recently tested out her famous lip kits on a younger audience—her 3-year-old niece North West and the toddler's fellow pal, Ryan Romulus

The two little girls proudly sported their new lip looks: a pink pout for Ryan and a bold black for North. 

In short clips shared on social media, Jenner was videotaped carefully applying the dark shade on her niece's lips. After inspecting the final look in the camera, West was clearly a big fan. 

The tot's ensemble was equally fashion forward. Kim Kardashian's oldest child sported a velvet slip dress layered over a white t-shirt Vans slip-on sneakers. To finish off the edgy '90s look, North also rocked two mini buns à la Sporty Spice. 

The impromptu mini makeovers took place during a Ferrari-themed birthday bonanza held in honor of Tyga's son, King Cairo, who turned 4 years old on Sunday.

As Jenner's longtime boyfriend, the "Rack City" rapper hosted many members of Kylie's clan at the party, including Kendall Jenner, Kris Jenner, Caitlyn Jenner, Kourtney Kardashian and Scott Disick.

There was no shortage of fun to be had—guests could enjoy horseback rides, inflatable slides, a ride on a Ferris Wheel and time on a trampoline. 

"He did such a good job," Jenner gushed about her man on Snapchat. "Worlds best dad."