I was 14 when I saw 'While you Were Sleeping' (of all things). The movie was very boring to me, but Sandra's been my special crush ever since.
Now that I think about it, I can remember another one going back to when I was TEN.
That's right: Melissa Joan Hart in 1991.
Now, remember, I was 10. That picture might not look like much to you now, but she was 4 years older than me. (That's a LOT to a 10 year old!) She may look like a dorky pre-teen to you, but at the time I honestly saw her like this in my mind:
EDIT: And yes, they both still rock. And yes, I know Melissa's got kids. No problem, she's even hotter now: