Look, it's teenage Kourtney Kardashian!

For Throwback Thursday, the eldest Kardashian sis posted a pic from her high school graduation in which she poses alongside her late father, Robert Kardashian.

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In the image, the mother-of-three rocks a long, white dress and a shoulder-length hairdo. And while she's certainly changed in the 20 years since this photo was taken, it's amazing to see how youthful she still looks at age 37.

Apart from brother Rob, Kourt is the only one of her siblings to go to college, earning a degree in Theatre Arts from the University of Arizona.

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Speaking of transformations, scroll down to see just how different the rest of the Keeping Up With the Kardashians cast looks since the show premiered in 2007!