In an Instagram post, Kylie said she shed tears over how fast her daughter's growing up.
"Thank you God for sending this little soul to me," she wrote. "Crying today because I can't stop the time. It's all the little things I'll miss like your cute voice and our long talks on the potty. Watching you experience everything for the very first time has been the best part of these last few years but on the other side I'm excited to watch you grow into the most special girl I know you will be and all the amazing things I know you will do. Happy birthday to my baby forever!!!!"
The proud grandmother wrote, "Happy Birthday to my beautiful granddaughter Stormi!!!!! You are the best daughter granddaughter, cousin, niece and friend anyone can imagine!!! You are so smart and funny and sweet and have a heart of gold.... and you have PATIENCE!!!!!! I love you so much Stormi Lou... you are such a huge part of my heart!!!!! Lovey Xoxox."