Get those shopping carts ready: Kylie Jenner and Kourtney Kardashian are days away from dropping new makeup together.

In a surprise joint cosmetic venture (aptly distinguished as the "Kourt x Kylie Collaboration") announced on Instagram by the Kylie Cosmetics mogul, the Kardashian-Jenner siblings are pairing up for an exclusive project to mark Kardashian's 39th birthday, which she celebrated Wednesday (April 18).

"HAPPY BIRTHDAY TO THE QUEEN! 👑 so excited to announce the KOURT X KYLIE collaboration," Jenner inscribed the promotional pic for her latest sibling-started collection, slated to arrive next week.

In the campaign ad, shown above, the 20-year-old mogul flaunts a daring flesh-toned single-piece accented by an oceanic backdrop as her big sis poses adjacent her in a nude-colored bodysuit while modeling one of their many velvet lippies in a blood-orange shade called Rad.

Among the forthcoming products releasing from the Kourt x Kylie collab is a mini eyeshadow palette trio, which comes in three different sets named by colors blue, green and pink. Some of the nominal shade names are said to be attributed to Kardashian's health nut lifestyle, like a silvery emerald called "Matcha" and "Gluten-Free," a bright mineral gold.

In a set of Instagram Stories, Jenner also provides a closer behind-the-scenes and various swatches of each new item from the line, which includes accompanying pressed powder palettes and two other new lippies — French Kiss and Minnie — created by Kardashian herself.

This recent relative-inspired addition to the Kylie Cosmetics brand arrives just months after the Life of Kylie businesswoman released her Weather Collection line back in February, which was sparked by her Jenner's daughter and firstborn child, Stormi Webster.

The Kourt x Kylie Collaboration launches April 24.

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