Let's make this birthday one to remember.

40 years old (Born on May 24, 1984)

Happy Birthday, Sarah Margaret Hagan! From navigating high school awkwardness as Millie Kentner in "Freaks and Geeks," to slaying vampires (or at least hanging around those who do) on "Buffy the Vampire Slayer," you've always brought humor, heart, and a delightful dose of geekiness to our screens. Your ability to make us laugh while simultaneously tugging at our nostalgic heartstrings is truly timeless.

Here's hoping your birthday is filled with fewer freaks and more geeks—because let's face it, geeks throw better parties anyway! May this year bring you continued success, laughter-filled moments, and roles as memorable as Millie's mathlete adventures.