Which pop star is the worst?

Nicki because her music is awful

I don't 'get' (and never have done) the concept of pop stars having security. They are just people like everyone else although most are so far up themselves they should be reported missing.
To answer the question, I said 'Other', the other being Kylie Minogue.

My brother in law use to do security for Taylor Swift and said she was a little entitled brat and her dad is impossible to deal with. I dont know about the others. Niki Manaj tries to sound like lil wayne idk the other 2.

Define what you mean by the worst please.