Watch Kris Jenner Rap in Honor of Her 64th Birthday!

MC Kris Jenner is spittin' bars for her big day!

On Tuesday on Instagram, Kourtney Kardashian celebrated her mom's 64th birthday by posting a hilarious video of the momager doing karaoke to son-in-law Kanye West's song “Mercy.”

“Happy birthday to the queen of everything (karaoke included),” the eldest Kardashian-Jenner sibling wrote.

Not to be outdone, Kim Kardashian expressed her “love and respect” to the “Keeping Up with the Kardashians” matriarch by posting a touching message on social media.

“Happy Birthday mama!!!! Today is your day! You are the best mom in the entire world,” Kim wrote. “I don't know how you do it! Seriously my love and respect for you grows every single day seeing how you manage to take care of 6 kids, a million grand kids and make everyone feel so loved and special. You've given us the tools to be the best we can be and have taught us that kindness rules the world! I can't wait to celebrate you today! I love you so much!”

Meanwhile, Khloé Kardashian gave props to the “super woman” for raising “mini Queens,” including Kendall and Kylie Jenner, as well as “young King” Rob Kardashian!

“You've been my biggest inspiration for all of the years of my life. Your strength, compassion, love, work ethic, beauty and your incredible generosity is beyond anything else I have witnessed,” the “Revenge Body” host added. “There are so many good things I could say about you. The list could go on forever.”