Can you believe Kylie Jenner is already 17?!?
As the E! star celebrates the big day, her four sisters are sharing hilarious throwback pictures and thoughtful messages on social media.
Kim Kardashian posted six photos when Kylie was just 9-years-old.
"To my baby sister on her 17th birthday...I was 17 when you were born and every day you have brought me such joy," Kim wrote. "I love living with you! I love how strong you are, funny and just so stylish!!!!"
Kendall Jenner followed Kim's leading by posted more pictures when Kylie was just a little girl.