Let's make this birthday one to remember.

55 years old (Born on April 28, 1969)

Happy Birthday, Sheryl Sandberg! From navigating the halls of Washington to steering Facebook through countless status updates (and a few pokes), you've shown us all how to lean in—sometimes so far we nearly topple over. Your courage in sparking conversations about working moms has inspired debates at dinner tables everywhere, proving once again that multitasking is your superpower.

Whether you're breaking glass ceilings or just updating your profile picture, you continue to empower women worldwide with grace and humor. Here's hoping this birthday brings fewer controversies and more cake—because even trailblazing COOs deserve a sweet break!

Cheers to another year of leaning in—and occasionally kicking back!