NEW YORK - 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 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.
Donnie Wahlberg, who was just 14 when New Kids on the Block debuted on the music scene in the late 1980s to wild fan craze, said he remembers the pressure and hard times that came with being a teen celebrity.
"Justin Bieber's making mistakes that everyone makes and he's probably trying things and exploring things that most kids his age explore, but the problem is he's got 50 paparazzi chasing him around when he does it," 43-year-old Wahlberg said. "Hopefully he'll get through these times and find his way into a long career and a healthy adulthood."
Bieber, his manager and his mother didn't respond to interview requests for this story. But the pressure was evident in the days after his collapse backstage at the O2 Arena, as the singer wrote on Instagram that he's sick of the "countless lies in the press" and that he would not be heading to rehab.
"I've accomplished more than I could've ever dreamed of, i'm 19 and it must be scary to some people to think that this is just the beginning," he wrote. "I'm a good person with a big heart. ... I'm human. I'm gonna make mistakes."
Since breaking out at 15 he's seen five of his albums hit No. 1 on Billboard's 200 albums chart and nearly 20 songs crack the Top 40. He's had several world tours, and launched a successful 3-D movie about his life.