Is there a condition for obsessing about other people?

I have a friend who often gets very obsessed with people at our high school. Our freshman year, she was obsessed with a girl who was rather popular and was a singer in one of our choir groups. My friend went as far to get her hair cut like her. This friend is rather childish, and she named a key chain of a lizard after her.

Our sophomore year passed without any major obsessions, to my knowledge.

Our junior year, she became absolutely obsessed with this guy in her band class. She had pictures of him in her locker and on her ceiling in her bedroom. She eventually gave up on him when she realized he (obviously) found her creepy.

And just a few minutes ago, she was talking to me about how she wanted to be someone from our school's acapella group. (Apparently she was just looking at their pictures and thinking about how 'cool' it would be to be one of them.)

Is there a condition for someone who does this?

hmmm...personal-obseesion-syndrom (pos) haha kidding. I don't know if there is actually a disease bout it it may be calssified as ocd thou (obsession cumplusive disorder) I don't know she may just not no who she is and may feel like obsessing is healthy or something.I don't know I no some people who obsses but not as bsad lol I wud suggest telling her that its creepin gu out and you need some spce or she needs to back off !u no?

You like like a pathological obsession or a fixation?
I dont know if there is an exact named disorder for that, I guess it would depend on why she becomes obsessed with these people exactly...

im not sure what exactly its called but thereis
also id say its a bit of jelousy
it doesnt sound like your freind is happy with herself at all if she wants to be other poeple and look like them.
she probably thinks they have it all, they get all the attention, guys, ect...its 'cool' to be them...so she tries to be them
she really should start to love herself for who she is