• Mia Talerico played Charlie in the Disney Channel series "Good Luck Charlie."
• She was 2 years old when she first started appearing in the sitcom.
• Talerico shared on Instagram that she's started high school.

Disney Channel's "Good Luck Charlie" took a stereotypical sitcom format — about a family raising young kids — and added a twist as Charlie's older sister produced a series of video diaries with advice for baby Charlie to watch when she was older.

And now that baby, played by actor Mia Talerico, has started high school.

Talerico took to Instagram on Wednesday to announce that she was attending her first day of high school after returning from a summer vacation in Paris.

In the photo, Talerico, now 14, can be seen holding a sign that says, "First day of ninth grade," alongside the date 8/21/23. 

A post shared by Mia Talerico (@miatalerico101)

Born in 2008, Mia Talerico was only 2 years old when she first started appearing in "Good Luck Charlie" in 2010. She also starred in the 2011 Disney Channel movie, "Good Luck Charlie, It's Christmas!"

The child actor was 6 by the time the show ended in 2014, after 98 episodes. She continues to work on projects like Brat TV's web series "Mani."

While "Good Luck Charlie" was popular with Disney Channel viewers, Talerico herself has gained internet notoriety over the years as a popular GIF of her character has become a memorable reaction meme among social media users.

via GIPHY

Talerico's "Good Luck Charlie" costar Leigh-Allyn Baker commented on the star's post, writing: "She's so big! Mia, you're beautiful!" Baker played Amy Duncan, Charlie's mom in the Disney series.

But over on X, the platform formerly known as Twitter, users were shocked at the revelation that Talerico has grown up so quickly — with many joking about how old they feel.

"This low key told me how old I am," one user wrote. Another added: "What do you mean she's not four?"

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