Mom and Daughter
How festive is this photo that Kris Jenner uploaded of her and her youngest child, Kylie Jenner, in none other than a birthday hat?
Smile for the Camera
It doesn't get more '90s than Kylie's butterfly skirt.
Close Up
A freckled-face Kylie minus a couple of baby teeth.
Fun in the Sun
Another cute snapshot of baby Kylie courtesy of Kris!
Sister, Sister
Kylie matching with older sis Kendall Jenner, though they definitely look like they could be twins!
Boat Buddies
The pair was clearly inseparable growing up!
Fine Dining
Look at that hair!
Stormi's Mom
Kris also included this candid snap of Kylie and her two-year-old daughter, Stormi Webster, in her celebratory Instagram post.
Play Time With Kendall
Who needs toys when you have laundry baskets?
Mirror Pic
Another photo of Kylie and Stormi courtesy of Kris—this one showing the adorable pair in matching outfits!
Baby Sister
The first in a series of photos that Kylie's sister, Khloe Kardashian, uploaded for her birthday.
Heartfelt Birthday Wishes
"How is my baby girl 23?! seriously how?" Khloe captioned her Instagram post. "But oh my goodness hasn't this been the most spectacular 23 years?! We have the best memories and yet we still have so much life to live!! What an exciting thought! This is just the beginning. Happy birthday sweet Kylie!"
A Sweet Photo With an Even Sweeter Message
Khloe's birthday message continued, "Your love, humor, generosity, confidence, empathy, charm, strength are just a few things I love and adore about you!! You motivate me and keep me in awe of you. We are all so blessed to have you. Luckier to be inspired by what an incredible mommy, sister, daughter and business woman you are."
Graduation Celebrations
Throwback to Kylie and Kendall's high school graduation party hosted by none other than Ryan Seacrest!
Sisters Forever
Khloe included cute throwback photos of Kylie and Kendall in her post, too. "Being your sister is one of the greatest blessings life has given me," Khloe added. "You have a heart of solid gold. You leave everybody better after meeting them. I sincerely thank God every single day for you and the rest of my family!"
All Together
It's always eventful when all five Kardashian sisters get together.
Big Smiles With Big Sis Kendall
"May you continue to be surrounded by blessings, love, happiness and laughter!" Khloe wrote, wrapping up her meaningful post. "I will love you until the end of time! I will happily spend forever proving it."
Kards Kisses
Blonde babes!
Sibling Cuddles
Khloe continued to share the love for Kylie's birthday by uploading a number of throwbacks to her Instagram Story!
One Big Happy Family
Aunts Kylie and Khloe cradling Psalm West and Chicago West!
Silly Sisters
Khloe wrapped up the birthday fun by sharing one final group shot!
Helicopter Hello
Not your average selfie!
Ski Buddies
Khloe and Kylie are a long ways from Calabasas in this candid shot!
Love From Kendall
Kendall also posted a series of throwbacks to her Instagram Story, including this adorable photo of her hugging baby Kylie, a.k.a. "little lady!"