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.
"the birthday gangstaaa ‘welcome friends' @kylieJenner," she posted with Kylie looking so young (and tough). "My best friend. I love you."
Kourtney Kardashian and Khloé Kardashian decided to switch things up and go with a collage for their respective Instagram posts.
Although Kourtney remains in the Hamptons with Scott Disick, she didn't waste any time in celebrating online.
"Happy birthday @KylieJenner! I miss you so much," she wrote. "Wish I was home celebrating with you."
Finally, Khloé couldn't miss the opportunity to share how much she loves her "spirit animal." Although she was also in the Hamptons , the feisty Kardashian didn't hold back her love.
"@kyliejenner you constantly amaze me with your wisdom, maturity, sensitive soul, confidence.... I could go on for hours and hours," she wrote. "You and all of my siblings have given me enough love to last me lifetime after lifetime."
She added, "I wish you and incredible birthday and I'm so sad I'm not with you today. This only means we get to celebrate your birthday when I'm back."
So much love for the birthday girl and it didn't stop with just family members.
Close friend Justin Bieber was able to celebrate earlier in the week. "Happy Birthday @KylieJenner ;) glad I got to spend it with u," he wrote on Instagram. "So dope watching u grow up."
All the messages and love didn't go unnoticed by the birthday girl.
"thank u everyone & T for the cake & JB for singing happy bday to me," Kylie shared with family and friends. "I love u guys."
Watch an all new Keeping Up With The Kardashians Sunday nights at 9/8c only on E!