Sister Khloé Kardashian, 38, was among the earliest of the Kardashian-Jenner family to send her well wishes.
Her effusive tribute read in part: “I have loved you before even knowing how to love. I have loved you since the moment we met and I have only loved you more with each day since. You will always be one of my best friends/favorite people in this scary world. But Life doesn’t seem as scary when we are facing it together. What would I do without you?”
She continued, “We are two peas in a pod. We go together like peanut ʙuттer and jelly. We are twin souls. Kourt you are irreplaceable to me. It’s hard to put into words the way I feel about you and our bond. Nothing will break you and I.”
Khloé shared a few birthday wishes for her big sister, including that “you continue to sparkle, you continue to live life just as you see fit. I pray that the magic in you only gets stronger and the fire of life I see in you never ever dims.”
She also told her sister: “You deserve every ounce of happiness, love and blessings that you receive! You deserve only greatness in this world! You are such a special soul. I miss you! I miss us wrestling and us being morons together but I guess we had to grow up at some point lol I am so happy for the love and life that you have found. I hope you know every single day just how much I can’t live without you 🤍”
The Good American founder name-checked some famous pairings as she signed the post: “Together forever, Jane and Suzanne Laverne and Shirley Yolanda and Towanda Arnold and Danny”
She also posted several pH๏τos of the iconic duos on her Instagram Story, along with pairs pics of herself and Kourtney including a snap of them in ʙικιɴιs captioned: “Don’t be scared to be a babe.”
Kim Kardashian also posted a loving tribute but acknowledged it’d be tough to “compete” with Khloé’s heartfelt caption.
“Happy Birthday @kourtneykardash! I really can’t ever compete with @khloekardashian’s birthday captions lol so I’ve just been sitting here trying to figure out how to express my deepest love for you and wishing you the most magical of birthdays,” she wrote beside a carousel of pH๏τos featuring the sisters throughout the years.
“I treasure every single memory we have ever made and I can’t wait to make so many more. I love you forever,” she added.
As with all of her kids’ birthdays, momager Kris Jenner kicked off her oldest daughter’s special day with a glowing tribute accompanied by a video of footage from Kourtney’s childhood.
“Happy Birthday to my beautiful first born child,” wrote Kris, 67, alongside the montage scored by The Temptations’ “My Girl.”
“It truly feels like yesterday that you were born,” Kris continued. “I can’t believe how fast time has gone by… I can remember every precious, incredible milestone, and how you came along that day and stole our hearts.”
She added, “You are such an incredible blessing and made all my dreams of becoming a mommy come true. Thank you for being the most incredible and amazing daughter, mommy, auntie, sister, wife and friend… you are beautiful inside and out! You are smart, talented, kind, creative, generous, loving, and are the best confidant and design advisor! You are the best to go to Disneyland with and you are the best shopping buddy! You are the best mom and I’m so proud of you each and every day.”
Kris concluded, “I thank God he chose me to be your mommy and I love you more than you will ever know. Mommy xo”
The Poosh founder was also celebrated by siblings Kylie Jenner and Rob Kardashian.
Jenner, 25, posted a sweet pH๏τo embracing her oldest sister on her Instagram Story and captioned it: “happy birthday my beautiful sister !!!”
Meanwhile, Rob, 36, posted a throwback pH๏τo of himself and Kourtney as she blew out birthday candles.
“I love you,” he wrote.
It’s been an eventful year for Kourtney, who tied the knot three separate times with husband Travis Barker, 47.
The pair first had a headline-making Las Vegas wedding at the One Love Wedding Chapel after the 2022 Grammy Awards on April 4. Since the ceremony wasn’t legally binding, they later wed at a Santa Barbara courthouse on May 15. Days after, they wed once more in a larger, more elaborate ceremony held in Portofino, Italy, on May 22.