Having worked security at two clubs and been employed as a bodyguard I can inform you that there is absolutely no criteria considering stalkers - and no fame requirements for being stalked. There are no certain guidelines. It can happen to anyone. And nearly any "type" of person can be a stalker. One time I found a rose and a note left for a dancer. In my car! Apparently he was under the impression that it was her vehicle. He broke into my car! Ooooh, spooky. Spookier is the fact that he revealed himself to her weeks later by asking her about his charming gift! Being barred from the club wasn't enough... it was a restraining order that finally convinced him that she was not the woman for him. The guy was wealthy, handsome, in shape, young and was a lawyer... the dancer was far from the most popular girl, attractive but what a whiner - and always broke.
Sorry, can't help you on the specific info you want (should be easy to google, I'd think). I really don't follow celebrity dish stories too closely - it just might be step one in becoming a stalker...