The countdown is on for Kim Kardashian's collaboration with her longtime makeup artist Mario Dedivanovic, and the beauty duo has finally given fans a taste of what they can expect from the new KKW x Mario collection. Kardashian took to Instagram on Monday to share a photo of herself wearing metallic blue eyeshadow, which is completely different than the pink-and-nude tones that make up the rest of her KKW Beauty line. The reality star revealed that this would be one of the shades in a new eyeshadow palette she worked with Dedivanovic to create, and there's a special reason why this particular color was included.

She wrote on Instagram: "A Metallic cobalt blue called Libra is a shade in our palette. @makeupbymario & I are both Libras & this shade of blue is special to us because I would fight against color & one time when I was on my phone & not paying attention he did a blue eye & I freaked out but then looked in the mirror I loved it! We fight over which look we should do all the time but this blue eye reminds me to trust him lol."

Kardashian and Dedivanovic also both shared a promo video for the upcoming collection, showing off the entire 10-shade palette. In addition to the blue "Libra" shadow, there will also be shimmery gold, bronze, nude, burgundy, and copper tones, as well as matte versions of the same colors. According to their posts, KKW x Mario will go on sale April 5.

The makeup artist and mogul have been working together for nearly a decade, and they have collaborated in the past on legendary makeup masterclasses. In a series of heartfelt Instagram posts on Monday, Dedivanovic paid tribute to the reality star, crediting her for much of his success in the past 10 years. "The past decade with Kim has been incredible. We've grown together, set trends, inspired and impacted an industry along the way. Through all her milestones and achievements and through her rise to global superstardom she has taken me along the way and impacted my life greatly, helping me to achieve unparalleled success of my own as a celebrity makeup artist," he captioned one of the posts, showing photos of his calendar from the day the met and the Vogue covers they've worked on together.

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This is my calendar from 2008 that I still have. 10 years ago, on April 5th, 2008 I met @kimkardashian on a cover shoot. I almost didn’t take the job because I had to work at Fox that afternoon where I did makeup for the anchors on the weekends for extra $. At this point I had been a makeup artist for 8 years in NYC, honing my craft, building my portfolio and paying my dues. Retail, weddings, editorial, TV, personal clients, assisting. I began working with some singers and actresses around this time & then I met Kim and began to work with her often. The idea of a reality star at the time was new. After all my years paying dues and assisting some of the big fashion and celeb makeup greats, I was being groomed to begin working with A list stars- actresses & recording artists. I had an agent who demanded that I stop working with Kim immediately. They said I would ruin my career and my career would end within a year or 2. That all of my hard work and struggles until then would be for nothing. Was I going to sit and worry about what the elitist industry would think of me and try to fit into their mold? I refused. I chose to stick with Kim because it felt right in my heart. She was hard working, loyal and sweet. She kept me insanely busy. She appreciated me and my artistry and I had too much respect for her. When I parted ways with my agency, one of the last things they said to me was “good luck, Mario because you will never get a Vogue cover working with her.” Swipe left to see how that turned out. Never let anyone dictate the trajectory of your life and career. The past decade with Kim has been incredible. We’ve grown together, set trends, inspired and impacted an industry along the way. Through all her milestones and achievements and through her rise to global superstardom she has taken me along the way and impacted my life greatly, helping me to achieve unparalleled success of my own as a celebrity makeup artist. I am so excited to finally announce that on April 5, 2018 - exactly 10 years to the day we met, our #KKWxMARIO collaboration with @kkwbeauty will launch! Turn on notifications for the very first reveal tomorrow! #KKWxMARIO

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Related: Dishing with Kim Kardashian’s Go-To Makeup Artist Mario Dedivanovic