Well, this makes us feel old!

It's been fifteen years since A Walk to Remember first premiered — and we STILL can't get over how sad it was. Jamie and Landon had the most unconditional love story, and it was tragically cut short when she died from leukemia.

MORE: See What the Cast of 'Romeo + Juliet' Looks Like Today

a walk to remember
R/R

Sigh, we're tearing up again.

The flick's star Mandy Moore is back in the spotlight now with her role on This Is Us, while Shane West has starred in TV shows Nikita and Salem.

Scroll through the gallery to see how much the cast has changed over the years!