"Mean Girls" was released in April 2004.

The teen classic starred Lindsay Lohan as Cady Heron and Rachel McAdams as Regina George.

Nowadays, McAdams still acts and Lohan has branched out to entrepreneurship, in addition to a short-lived MTV reality show called "Lindsay Lohan's Beach Club."

Visit Insider's homepage for more stories.

"Mean Girls" has solidified itself as a teen classic.

The popular movie got its own holiday fan-dubbed "Mean Girls Day" on October 3 in honor of the time Aaron Samuels asked Cady Heron, played by Lindsay Lohan, what day it was.

The movie is also remembered for trying to make "fetch" happen. And its popular characters have even been reimagined in a new musical.

With all that in mind, it's a good time to honor the original stars of the movie and find out what they've been up to in the 16 years since "Mean Girls" was released.

Anjelica Oswald contributed to a previous version of this article.