Happy National Mean Girls Day! It's hard to believe that the instant pop culture staple premiered over 13 years ago. So grab your pink shirt, sit back, and let's remember the movie that never gets old. Even after all these years the stars of the iconic flick still have fun fan encounters reminding them how much the movie resonated with its audience.

"I was staying at a bed-and-breakfast recently in the-middle-of-nowhere Ireland," Rachel McAdams (who played Regina George) told Entertainment Weekly. "And one of the owners’ granddaughters came up to me, and she gave me a piece of pink paper and she goes, 'Can you write down just a few of your favorite Mean Girls quotes?' It was so sweet. I couldn’t think of any of them! It’s been 10 years! So I said, 'Well, what are your favorites?' So she literally fed me all these lines, like 'Is butter a carb?'"

And the cast has been reminded by fans the significance of Oct. 3. "I was leaving the playhouse the other day," Lindsay Lohan continued. "These kids were outside, and someone said, “Do you know what day it is?” and someone said, 'It’s Oct. 3!' I was like, 'What? I don’t understand!' I didn’t know what they meant. Then I realized it! [Laughs]"

Lacey Chabert added, "My new nephew was born on Oct. 3. My brother came home from work and goes, “Everyone at work keeps going, ‘Oh, your baby is so lucky! Your baby is born on Mean Girls Day!’ ” He goes, “What is that? Can you explain that to me?" And the legacy continues!

Click through the slideshow to see what Rachel McAdams, Amanda Seyfried, and the rest of the cast look like then vs. now!