Mental disorders are quite common among celebrities. Narcissism is one of the most common mental disorders, and I am sure that Kanye, Nicki Minaj, and Chris Brown have it to the full extent. Several others too, but its most noticeable in these three. I think Xtina also has some signs.
Other notable celebs with different mental disorders:
http://health.discovery.com/tv/psych...disorders.html
Catherine Zeta-Jones: Bipolar disorder II (does not reach the full on mania)
Mel Gibson: Bipolar
Emma Thompson: Depression
Michael Phelps: ADHD
Howard Hughes - OCD
Elton John - Bulimia
Sinead O'Connor - Bipolar
Kurt Cobain - ADD, Bipolar
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I am sure there are many others. Britney obviously has some kind of a disorder, and so do others.
It is not something to laugh at, these people struggle and their symptoms might be exacerbated by their fame, because its their job to be in the center of attention. Narcissists might seem cocky, but in reality they also struggle, cause in reality deep down they are insecure.
What other celebs can you think of who have some kind of mental disorder? and why do you think it is so common in Hollywood?