Article: Stuck on ... them: Narcissism has seven deadly traits, which these stars happen to embody. A study guide.

Celebrities are more narcissistic than the rest of the population, a new study from the University of Southern California has concluded.

(Take a moment to recover from the shock.)

The study is considered groundbreaking because it's the first systematic, empirical scholarly study of celebrity personality -- that is to say, it's delving a little bit deeper than an "Access Hollywood" interview.

The term "narcissist" isn't just an insult. It's also a psychological personality type. "Narcissists generally crave attention, are overconfident of their abilities, lack empathy, and can evince erratic behavior," said Dr. Drew Pinsky (at right), an assistant clinical professor of psychiatry at USC ...

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