Kris Jenner sent heartfelt birthday wishes to her eldest daughter Kourtney Kardashian.

The Kardashian-Jenner clan mom shared a series of adorable photos of the birthday girl along with a sweet caption.

She began her message by writing: “Happy birthday to my firstborn baby doll @kourtneykardash!!!!!! What’s going on in the world, time flies and I can’t believe you’re 45!!!”

Chris shared sweet memories of little Kourtney growing into the most amazing woman.

“It seems like just the other day you were wearing your 5-year-old party hat to work as a line leader at Buckley, and I was bringing cupcakes for the class to celebrate,” she said.

The socialite said her daughter “has grown into the most beautiful, amazing daughter, wife, mom, sister, aunt and best friend a girl could ever have.”

Talking about Courtney’s business ventures PushChris shared, “You are an amazing business owner and I am so proud of you every day!”

“Thank you for making me a grandma for the first time and thank you for sharing every moment and memory we share. I love you beyond measure,” the reality star concluded her note.