Staying true to the title of the thread, I'll say my weirdest
crush as a kid would have to be Christina Ricci at the time she did Addams Family. I had an Adams Family book that had one of her headshots back then and remember thinking she was really pretty.
Couldn't find the headshot online but I'd say this is the closest.
I can name tons of other not so weird crushes I had as a kid but that's now what the thread is about.