do Du think Berühmtheiten have their own Favorit celebrities?...

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Uh... I don't know about those of which Du have listed, but yes, I do believe Berühmtheiten have their own Favorit celeb.
It makes sense.

Of course they do! It's not because you're famous that Du can't be a Fan someone else! Here's an example: the schlagzeuger of Styx is a Fan of Breaking Bad and RJ Mitte who stars in Breaking Bad went to see Styx in konzert because he's a Fan of Styx... :D

Of course yes!
Justin Bieber was obcessed with Beyonce!!! :D

yes

Yes...it only makes sense. They are real people with Favoriten like us...only most of us aren't rich oder well-known...but everyone has some sort of obsessive side.