Kourtney Kardashian celebrated the big 3-7 on Monday, and she spent the day exploring Iceland with Kim Kardashian, Kanye West, and pals Jonathan Cheban and Simon Huck.
The group took fans along for the ride as they snapped photos and videos of a stunning waterfall.
"That is gorgeous," Kim said on SnapChat.
Later, the famous family and their BFFs took pictures "chillin' on a glacier," as Kourtney put it.
While the entire Kardashian clan couldn't be together on her day, they all shared special messages for the mother-of-three.
Momager Kris Jenner took to Instagram to post a series of throwback pics of her firstborn.
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"I know it's crazy but I remember this pic like it was yesterday.. You have brought so much love, joy, and happiness into my life and I'm proud to be your Mom.. You teach all of us everyday what it means to be an amazing daughter, Mom, sister, friend, and a genuinely beautiful human being. Thank you for being such a bright light and an inspiration to me every day," she wrote. "You are kind and patient and have the biggest heart and I love you more than you will ever know. You will always be my firstborn who captured my heart....Oh, and I'm really sorry about this outfit I put you in....I love you, mommy #love #blessed #mybaby."
Khloe Kardashian got in on the fun and shared a hilarious picture from when they both were little. "Happy birthday @kourtneykardash!! What would our family do without you?!?!" she wrote alongside the photo. "This picture sums us up, even though I'm covered in chicken pox, you're still chillin by my side. I love you!!!"
Check out the gallery at the top to see more from Iceland, and click through the photos above to see how the Kardashians have changed over the years.