The INSIDER Summary:

• Kylie Jenner told Fast Company that her housekeeper models her lip swatches in Snapchat videos.
• Kylie Cosmetics has become wildly popular since its debut in 2015.
• The company has a fortune of $400 million in revenue.

Whenever Kylie Jenner teases her lip kits on Snapchat, there's usually a moody Drake or Kanye West song playing in the background as she paints swatches of her lip products on an arm.

If you've never seen one of these videos (where have you been?), essentially they all look like this:

If you thought it was her arm in these videos, you'd be wrong.

Turns out, the mystery arm belongs to her housekeeper!

In a recent interview with Fast Company, Jenner divulged that her unnamed housekeeper has been modeling her lip kits, inspiring them to sell out moments after they're released every time (emphasis ours):

Everyone knows when I'm releasing a product on Snapchat that I will be MIA for the next hour and a half. I'm running around my house, finding the perfect lighting, the perfect swatches. My housekeeper, I use her arm for my Snapchats. She has the best arm for swatches. She's so nice and just sits there and has her arm ready and lets me do my thing. I care a lot about what my products look like when people first see them.

As The Cut points out, Kylie Cosmetics has amassed a fortune of $400 million in revenue since its debut. It begs the question if Jenner's housekeeper is seeing any of that money for her Snapchat modeling side job.

In the interview, Jenner also addressed some of the mistakes the company has made. Though she didn't name them explicitly, we're pretty sure some of those mistakes include selling empty products and coming up with controversial product names.

"It's a new business, and I'm going to make mistakes," she told Fast Company. "Kylie Cosmetics blew up so fast that I didn't have that much room to make mistakes. Starting businesses make a thousand mistakes, and no one ever sees them. Everyone on my team tries their hardest to not make any, because they know it goes back to me."

As a key part of the Kylie Cosmetics business, Jenner's housekeeper is probably keeping her arm very still.

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