Kylie Jenner and Kim Kardashian are two of the most successful of the Kardashian-Jenner siblings, or at the very least, the most lucrative. 

So it makes sense that there might be a little bit of a sister rivalry going on between the two. Especially considering they're in the same industry. In Kylie Jenner's latest YouTube video, she applied her big sister's makeup, and the two jokingly competed and dissed each another's companies. 

Some fans noticed that Kardashian totally shaded Jenner's product on camera, but at the end of the day, there's nothing but love and support between these two sisters. 

Kylie Jenner worked as her big sister Kim Kardashian's makeup artist in a new Youtube video. 

Kardashian rarely lets anyone, besides her longtime makeup artist Mario Dedivanovic, do her makeup. So it was very special that Kylie Jenner got to do her own signature glam on her notoriously picky sister. In the video they answered some fan questions and got a bit competitive with one another, though in a totally joking way. 

Fans definitely noticed that the two had a joking competition going on.

Kardashian commented on Jenner's facial mist product that had major difficulty pumping, as most new bottles do. Instead of brushing it off, the sisters laughed about the error, and Kardashian could be heard saying under breath, "Cheap [redacted]!" 

Fans caught the humor, though, and appreciated the silly rivalry. 

The two also joked about which of them their mom, Kris Jenner, loved more and … the answer is obvious. 

Sorry, Kim, but your reign has come to an end! While Kardashian may have initally been Kris Jenner's star in the making and favorite kid out of the six Kar-Jenner kids, Kylie has trumped them all. Now Kylie and Kris Jenner are a dynamic duo and business boss ladies. 

Better keep your cosmetics locked up, Kylie! Kim's coming for you!

Kardashian also joked that she was going to steal the secret formula for one of Jenner's lip kit combos to use in her own KKW Beauty. "We love a comedian!" one fan tweeted along with the clip. The two are really nothing but supportive of each other's cosmetics brands, and they have even collaborated with one another. 

At the end of the day, it's all in good fun, and there is definitely no shade between the sisters. 

While seeing the competitive side of these sisters is a fun and new perspective, it's nothing to be worried about. There's always drama in the Kardashian-Jenner clan, as we've seen in numerous episodes of KUWTK. But when it comes to their businesses, these two couldn't be happier for each other.