The Kardashians Celebrate Kourtney's Birthday With Sweet Messages and Throwback Photos

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Kim Kardashian West, Khloé Kardashian and Kourtney Kardashian

LARRY MARANO/WIREIMAGE

BY LINDSAY KIMBLE

@lekimble

04/18/2015 AT 04:35 PM EDT

They say it's your birthday!

Kourtney Kardashian turned 36 on Saturday, and her famous family took to social media to honor the Keeping Up With the Kardashians star on her big day.

Kardashian's mom, Kris Jenner, and sisters Khloé Kardashian and Kim Kardashian West all shared throwback pictures along with sweet (and funny!) messages about the mom of Mason, Penelope and Reign.

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Jenner, 59, posted a photo of her beaming younger self, holding baby bonnet-clad Kourtney as an infant.

"Happy Birthday Kourtney!!!! I think you can tell by this pic I was obsessed with you from the moment you were born...," wrote the momager. "You are the very first love of my life, my soulmate, my ride or die, my everything. When you were born I realized what true love really is."

Younger sister Khloé, 30, echoed her mother's statements, writing, "Kourt you are the yin to my yang, the Siegfried to my Roy, the Lucy to my Ricky, The Thelma to my Louise, the Wayne to my Garth, the Posh to my David, the sugar to my spice, the icing to my cake" underneath a photo montage of the duo.

Khloé even joked about her sister's infamous vocal fry, writing "Happy birthday to one of the most monotone chicks I've ever met. It's one of my favorite things about you!! Bible!"

Kardashian West, 34, also used social media to honor the Kourtney and Kim Take New York star on Saturday, sharing a selfie on Instagram and Twitter. North West's mom called her sister "the best mom" and expressed how excited she was for their children to "grow up together as if they are siblings."

"I learn so much from you everyday! I Love you and I'm so proud you are my sister! Don't know what I would do without you!" wrote Kardashian West.

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