Fans of throwback Nickelodeon shows like Naked Brothers Band, Sam & Cat, iCarly, Big Time Rush, Drake & Josh are about to feel pretty old because most of the stars that they grew up watching are all grown up themselves now — and boy, do they look different.

Take Ariana Grande, for example. She starred in Victorious when she was only 16 years old, and now she’s 26! What about Jamie Lynn Spears? The actress was only 13 years old when Zoey 101 premiered, and now she’s a full-fledged adult with a husband and two kids!

Fans have truly had the pleasure of watching them grow up right in front of their eyes. J-14 went ahead and rounded up a bunch of then-and-now photos of some more fan favorite Nickelodeon girls, so prepare to be shook over how much they’ve all changed over the years.

Scroll through our gallery to uncover 25 Nickelodeon girls who look completely different now compared to when they first started on the network.

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