Not stalker status (I hope) but I did follow some celebs in the past. I don't know if it's called a "crush", but the two most recent ones I obsessed over were Greyson Chance and Asa Butterfield. First two weeks after finding out about them I'd want to find out all about them (but not so private as addresses and such), all the films/albums they've done and such, follow their twitter feeds/youtube channels. Then third, maybe fourth week, logic takes over, realize I'm obscenely creepyX_X, then the obsession fades quickly. I may still have their albums and films, but only because it's interesting and not really about them anymore. The good thing is, I've never had that level of obsessions ever since.
Fuck, I just wish I could burn out these feelings sometimes...~X( I feel like a fucking creeper now.