Good boy gone bad? Justin Bieber's adult problems

NEW YORK (AP) - In just four years, Justin Bieber has gone from fielding innocuous questions about his haircut to denying that he's in desperate need of rehab. Bieber's grown up and into tabloid territory, with his recent troubles making some question whether he's just the latest teen star gone wild.

In what could have been his worst week ever, the 19-year-old pop star struggled with his breathing and fainted backstage at a London show, was taken to a hospital and then was caught on camera clashing with a paparazzo. Days earlier, he was booed by his beloved fans when he showed up late to a concert.

Those incidents come after photos of Bieber appearing to smoke marijuana hit the Web, and some headlines have suggested that the ultra-popular star is going through a famous Britney Spears-style meltdown.

Others suggest he's struggling with a more common condition: being a teenager.