Kris Jenner is taking a trip down the memory lane on her first born Kourtney Kardashian’s special day.

Celebrating her precious girl’s 46th birthday, the momager took to her Instagram on Friday, April 18 to pen a heartfelt birthday tribute along with rare childhood photos.

“Happy Birthday to my first born, my gift from God, my beautiful Kourtney!!!!,” she wrote in the caption of a 20-slide carousel. “The day you made me a Mommy my world completely changed, and ever since, you have given me so much joy, love, purpose, and the most beautiful memories I could have ever dreamed of.”

The cover photo featured a younger Kris smiling for the camera while holding baby Kourtney. The vintage snapshot was followed by several pictures of the eldest Kardashian-Jenner clan sister from her scool days.

“I thank God every single day that he chose me to be your Mom,” the Jenner Communications CEO added, before making a major confession, “You are the most amazing daughter, wife, mommy, sister, auntie, and friend… and you inspire me every day with your strength, your faith, your heart, and your ability to live life on your own terms.”

“I wish you the most magical birthday, my precious girl!!! I love you with all my heart forever and ever,” the mother of six wrapped up the caption. “Mommy [red heart, flying kiss and celebrations emojis] @kourtneykardash.”

Among the series of photos, one image showed Kourtney posing alongside her late father Robert Kardashian, her daughter Penelope, her son Mason, and her current husband Travis Barker.

There were also pictures of Kris, 69, and Kourtney together from the daughter’s different wedding ceremonies.