If you've been keeping up with Kim Kardashian West or Kylie Jenner recently — and let's assume you have, because who isn't? — You may have seen them on social media posting some makeup swatches and behind-the-scenes footage from a photo shoot they both appeared in.

Many people have been wondering what all of this hype is about, and now we know. The famous sisters are collaborating, and have created four new liquid lipsticks! Oh, and did we mention that they're available right now?

What's in a name?

The collaboration, which launched today, is centered around Kim Kardashian West's signature nude lips.

Each of the four shades is named after different nicknames that her family and friends call her. According to the Kylie Cosmetics website, the new collaboration includes shades Kimberly (a true nude), Kim (a peachy nude), Kiki (a pinky nude), and Kimmie (a deep nude).

The lipsticks also boast an entirely new, crème liquid Lipstick formula for Kylie Cosmetics, which has buildable, sheer to medium coverage, with "a luxurious and creamy finish." It is certainly a departure from the other matte liquid lipsticks Jenner's sold in the past, which claim to have full coverage that lasts for hours.

The reviews are in

Of course, what's a launch without reviews? Beauty YouTubers, including Manny MUA, recently examined the kit and said he was "pleasantly surprised" by the beautiful packaging and formula.

However, he did cite one concern regarding the shades, saying, "I do not think that this range of colors is the most suitable for darker complexions, I just don't." If you've got a darker complexion and wanted to try these lipsticks out, he suggested pairing them with a darker lip liner to compliment the shades and add some depth of color.

Other beauty Youtubers like Jeffree Star, who has had issues with Kylie Cosmetics products in the past, also voiced his concern about the shades perhaps being too light to suit all skin tones.

Will you be buying it?

While Kylie Jenner's lip kits sell out in mere minutes, it will be interesting to see how this collaboration fares against her other products because of the concerns about the shades not being inclusive of all skin tones.

The lipsticks also are not available for purchase separately, so if you want one, you've got to buy them all. However, at $45 for the kit with all four shades, it's quite a bargain for those who may just want to try them out for fun, or for their own Youtube reviews.