I've noticed many of the posts here seem to be based on "former" beauties so I'll add my very first crush with an actress.
my dad took my sister and I to see "The Pirate Movie" when I was about 8. I then saw... Kristy McNichol. To this day, it's the only musical I've ever seen that didn't make me want to stab screwdrivers into my ears.
I only really remember 2 things clearly though.
1. An old pirate wearing a huge cod piece and singing a funny song with the line, "I am the very model of a modern major general".
2. Suddenly, girls didn't seem "yucky" to me anymore thanks to McNichol.

I was SO in love with her when I was a kid.