Kylie Jenner has created an apic makeup empire thanks to her penchant for lip liner, and in true Kardashian fashion, has collaborated with her sisters on the brand. 

With big sister Khloe, the teen released a line of lip glosses, while with Kim, the pair opted to create a series of nude matte lip sticks. 

The only sister who haven't but their name to Kylie Cosmetics are Kendall and Kourtney, but that could be about to change. 

 

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One eagle-eyed KUWTK fan spotted that in the background of an ad for an upcoming episode, there is a mysterious empty lip gloss tube mixed in with some Kylie Cosmetics samples. 

The empty tube clearly has the work Kourtney stamped across it in bold letters.

Kourtney, hailed as the sassiest and most sarcastic sister, has been our fave Kardashian from the get-go, and we would love to see what she and Ky could come up with. 

With Kourtney's penchant for a nude lip and sheer highlight, we're hoping for something with a neutral, natural feel. 

However, with Kylie's Kourt K lip kit, dedicated to her big sis, she opted for a dramatic, vampy purple, so who knows what the sisters are going to pull out of the (makeup) bag?

We're sure Kylie will be the one updating us via Snapchat, as is her usual method of announcing new makeup endeavours.