It was only a matter of time before the Kardashians used the contouring trend on their favorite body part — the booty!

Kourtney Kardashian gave fans a behind-the-scenes look at a top secret magazine cover shoot, and along with showing off her toned legs, the 37-year-old revealed the secret to a picture-perfect butt.

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"We're doing a little booty highlight," the KUWTK star says while her makeup artist, Mario Dedivanovic, goes to work with a makeup brush.

"Your ass is looking good, girl," Mario adds at the end of the video, while celebrity hairstylist Chris McMillan looks on.

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Following her breakup with Scott Disick, the mother-of-three has been showing off her curves non-stop on social media, including a revealing Snapchat moment in lingerie.

Get it, Kourt!