The momager of the Kardashian-Jenner clan shared a series of adorable photos of the birthday girl alongside a sweet caption.
She began her note by saying, "Happy birthday to my firstborn babydoll @kourtneykardash!!!!!! What in the world is happening, time is twirling so fast and I can’t believe you are 45!!!"
She stated, "It seems like just the other day you were wearing your 5 year old party hat going to Buckley to be the line leader and I was bringing cupcakes for the class to celebrate."
"Thank you for making me a grandma for the first time and for every single moment and memory we share. I love you beyond measure," the reality TV star concluded her note.
