Kendall Jenner

Instagram

Kids grow up so fast these days.

It's no secret that Kendall Jenner has become one of the most sought after models in the world. But long before walking in runways or posing for prestigious publications, the Keeping Up With the Kardashians star was just a young girl smiling for her sister's camera.

Need proof? Just look at Kylie Jenner's latest Instagram post that included an epic throwback photo of her sibling.

In the snapshot, Kendall smiled for the camera while showing off her missing teeth—and likely waiting for the tooth fairy to arrive.

"I miss u @KendallJenner," Kylie captioned the post. Kendall replied, "Agh I miss you." As for what other family members think of the special throwback, they're crazy in love as well.

"Cutie," Khloe Kardashian shared in the comments section while Hailey Bieber simply wrote, "OMG."

"Oh you have a window in your mouth!!" Kris Jenner shared while Caitlyn Jenner added, "Something is missing…"

Kylie's latest pic has us wanting to go back in time to Kendall's life growing up in the spotlight.

Before walking in New York Fashion Week or receiving 121 million Instagram followers, the E! star was just a Calabasas resident growing up in a famous family. Take a trip down memory lane in our gallery below.

Kendall Jenner

Kendall Jenner

Bruce Jenner, Kris Jenner, Kylie Jenner, Kendall Jenner

Scott Nelson/AFP/Getty Images

Bruce Jenner, Kris Jenner, Kylie Jenner, Kendall Jenner

Cesare Bonazza/WireImage

Bruce Jenner, Kylie Jenner, Kendall Jenner

Lee Celano/WireImage for Hollywood Reporter

Bruce Jenner, Kris Jenner, Kendall Jenner

Jeff Vespa/WireImage

Khloe Kardashian, Kylie Jenner, Kendall Jenner

Lester Cohen/WireImage

Kendall Jenner, Kylie Jenner

Jesse Grant/WireImage.com

Kendall Jenner

Jason Merritt/Getty Images

Kendall Jenner, Kylie Jenner

Noel Vasquez/Getty Images

Kim Kardashian, Kendall Jenner, Kylie Jenner

Kevin Mazur/TCA 2010/WireImage

Kendall Jenner, Kylie Jenner

ROBYN BECK/AFP/Getty Images

Kendall Jenner

Brendon Thorne/Getty Images

Kendall Jenner

KVS/Shirley/PacificCoastNews.com

2013 American Music Awards, Kendall Jenner

Jason Merritt/Getty Images

Pucci, Milan Fashion Week, Kendall Jenner

Pier Marco Tacca/Getty Images

Kendall Jenner, Chanel Collection

FameFlynet, Inc

Kendall Jenner, H&M

Pascal Le Segretain/Getty Images

Fashion Police, Kendall Jenner, amfAR Gala

Michael Loccisano/Getty Images

Kendall Jenner, Harry Styles

Instagram

Kendall Jenner, MTV Movie Awards 2016

Frederick M. Brown/Getty Images

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