Are we allowed to be, like, obsessed, with singers/actors

like, the jonas brothers are all over my room, my computer, my speech, my clothing, my life (its called ojd : obsessive jonas disorder). my grandpa always gets really mad at me for that and says its not islamic. am i missing something? cuz i dug up alot of leonardo dicaprio flipbooks in my aunts house. are we not allowed to like stars?