Justin Bieber's neighbors aren't happy: Complaints about the teenage multi-millionaire pop star range from speeding through the neighborhood to spitting in someone's face to, most recently, egging a nearby house.
Whatever the current investigation turns up, Bieber is certainly not the first example of a child star misbehaving, but it raises the question: Why do child stars so often fall apart?
Several factors probably come into play, experts said, including personality, a unique upbringing, and an early sense of entitlement.
Frank Farley, a former president of the American Psychological Association who studies risk taking, has a name for the type of personality often shared by celebrities: T-type, or thrill-seeking.
"It's what gets them to where they are," he said. "They're pushing the envelope, they're taking risks. Going to a casting call and being judged -- most people couldn't tolerate it. One of the top 10 fears in America is speaking in public."
Type T personalities are often highly creative, people who can handle uncertainty and risk. It would be hard to make it in Hollywood without those qualities. But there can be a downside.