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Here's How The Kardashians Are Wishing Big Sis Kourtney Happy Birthday

Kim, Khloe, and Mama Kris are spreading the love.

Kourtney Kardashian turns 36 today, and her family is sending their best wishes across social media.

Kim kicked things off with a long post on Instagram dedicated to her beloved sister:

"Happy Birthday to my big sister @kourtneykardash," she wrote. "You were always there for me to copy everything you did when we were kids and now you are there to teach me everything as an adult! You are the best mom and I'm so happy our kids get to grow up together as if they are siblings! I learn so much from you everyday! I Love you and I'm so proud you are my sister! Don't know what I would do without you!"

Khloe soon followed, posting a montage of pictures to her Instagram page. In her long caption she compared her relationship with Kourtney to many famous dynamic duos from history:

"Kourt you are the yin to my yang, the Siegfried to my Roy, the Lucy to my Ricky, The Thelma to my Louise, the Wayne to my Garth, the Posh to my David, the sugar to my spice, the icing to my cake."

Not to be outdone, Kris Jenner posted photo of her holding Kourtney as a baby, along with a long, heartfelt message to her eldest daughter:

"When you were born I realized what true love really is. You are the most amazing Mom I have ever known, the best daughter, friend, sister, and partner and you are loyal to a fault...you are the most beautiful person inside and out and I am so blessed and honored to be your Mom and we are all better because we get to share life with you. Happy Birthday sweet girl I love you more than you will ever know. Mommy xo"

36 is shaping up to be a big year for Kourtney: she had a new baby, Reign Aston Disick, in December, and Keeping Up With The Kardashians is back for a new juicy season. Stay tuned.