Even though we knew them as kids, child stars can't stay little forever.
And while some formerly famous tots don't age all that well, others came out of puberty looking better than ever!
Take Jonathan Lipnicki, the adorable little blonde kid from movies like Jerry Maguire, Stuart Little, and The Little Vampire.
You'll remember him as the little kid who knew the exact weight of a human head, but today, he's totally hot! But that hasn't stopped him from being bullied in the age of social media.
In a post on Instagram, Jonathan got candid about the struggles of growing up in the spotlight.
"As a kid/teen, I was made fun of relentlessly by some people who are now even my friends on FB," he wrote. "I was told I was a has-been and would never book a job again. I was made to feel like garbage every day of middle school to the point where I had a panic attack every night before school, because I wondered how I would get through the next day."
While it's clear that the now 26-year-old faced some tough times growing up, he ended the message on a positive note.
"Chase your dreams," he continued. "It's amazing how mean people peak in their teens. Thank you to everyone who has supported and continues to support me."
Scroll through the gallery below to see more formerly nerdy child stars who grew up to be hot!