Let's make this birthday one to remember.

46 years old (Born on January 25, 1979)

Christine Lakin, you've been charming us from day one as Alicia 'Al' Lambert on "Step by Step," delivering wit and sass in equal measure. Your perfectly timed comebacks made the world wish they had a sibling like you—or at least that awesome denim jacket.

Years later—and you're still stepping up (pun fully intended). Whether it's directing or making surprise TV appearances, your dynamism proves there's no career step too big—as long as Patrick Duffy's parenting prepared you well!

Happy birthday to everyone's favorite smart-talking teen turned brilliant woman; may today bring laughter that's bigger than Frank’s blended family dinners!