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A photo posted by Kris Jenner (@krisjenner) on

Happy birthday, Kendall Jenner!

The model and Keeping Up With the Kardashians star turns 21 today, and this milestone B-Day has her family feeling quite nostalgic for the little girl they've watched grow up into an incredible young woman.

Momager Kris Jenner was especially sentimental about her daughter reaching another milestone. She Instagrammed a sweet photo collage of Kendall through the years, writing, "Happy 21st birthday my sweet angel, @kendalljenner!!!!! You are so beautiful inside and out. Thank you for being YOU and for blessing us with your kindness, your adorable sense of humor and your love."

"I am blessed beyond belief to call you my daughter," Kris continued. "You make me proud every single day, and I love you so much!!! Happy birthday mybeauty!!! #lovemommy #proudmama"

Big sis Khloe Kardashian was feeling nostalgic as well. She posted a picture of Kendall from 2000 on her app, writing, "My little Kendall is all grown up!"

"I could not be more proud of the amazing (not to mention fierce AF!!!!) young woman that you have become," she wrote. "Your first legal drink is on me, boo! Happy birthday!"

A photo posted by Kylie (@kyliejenner) on

Kylie Jenner Instagrammed a sweet tribute, too, writing, "happy birthday Kenny. My other half. I wouldn't be me if it weren't for YOU we dreamt about the day when you'd turn 21 & I'd be 19. It came too fast  ... But who you are and where you are today was beyond my wildest expectations! You are an angel my supermodel sister. I love watching you live out your dreams. Every Kylie needs her Kendall"

Caitlyn Jenner Instagrammed her wishes, too, writing, "School, track practice, cheerleading practice, all that carpool! Now my little girl is 21! Wow, so proud of you, happy birthday."

The rest of the family's social media tributes will likely pour over the course of the day. Last night, a host of Kendall's family and friends came together to celebrate her turning the big 2-1 at Delilah Los Angeles. In addition to Kris and Khloe,  Kourtney Kardashian was there. A source also tells E! News that Kim Kardashian and Kanye West made an appearance around midnight to sing happy birthday. They also presented her with a birthday cake that featured a photo of Kendall as a kid.

Other attendees included Hailey Baldwin Jordyn Woods, Cindy Crawford and her kids Kaia Gerber and Presley Gerber, Jordan Clarkson and Travis Scott.

Watch a brand-new episode of Keeping Up With the Kardashians Sunday at 9 p.m., only on E!