We can't wrap our heads around the fact that Mean Girls was released thirteen years ago. THIRTEEN. As much as we may try to cling to our youth, the fact remains that Regina George's little sister is now a full-blown adult!

Yup, Nicole Crimi, who played Kylie (the OG Kylie, of course), is 19 years old — and looks completely different (thanks puberty). As if we didn't feel ancient enough already, she's currently a college student, but hasn't actually appeared in a movie since 2006, according to her IMDb page. She does happen to be a rather brilliant artist, though.

It feels like just yesterday the blonde beauty was dancing to Kelis' "Milkshake." Sigh. In honor of Mean Girls Day on Oct. 3, Nicole posted a throwback pic with Amy Poehler, aka her mom in the film. And back in 2016, she shared a photo of herself posing alongside Lindsay Lohan, which also featured Amy, Jonathan Bennett (Aaron Samuels), and Lizzy Caplan (Janis Ian) in the background!

Jonathan was joined this year by co-stars Amanda Seyfried (Karen Smith), Lacey Chabert (Gretchen Wieners), and Daniel Franzese (Damian) in a video to help raise funds for the Las Vegas shooting victims. "Look, we know fetch is never going to happen, but we can make this happen,” Lacey said in the clip, while Daniel added, "So you go, Glen Coco!" By the way, we're still waiting patiently for the sequel.

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"On October 3rd he asked me what day it was." "It's October 3rd" Happy #nationalmeangirlsday 💋

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This post was written by Carl Smith. It originally appeared on our sister site, heatworld.