Justin Bieber lashes out at media's 'countless lies' about him

Pop star Justin Bieber struck back at his critics on Thursday, denouncing the "countless lies" written about him after a week in which he canceled a concert, collapsed on stage and had a run-in with paparazzi.

In a lengthy posting on his Instagram profile, the 19-year-old singer said he was not going into rehab, contrary to some media speculation, and felt he had done nothing to deserve the negative press surrounding his European tour.

"Everyone in my team has been telling me, 'keep the press happy' but I'm tired of all the countless lies in the press right now. Saying I'm going to rehab and how my family is disappointed in me," Bieber wrote.

Bieber, who has more than 35 million Twitter followers, suggested on Thursday that envy of his success might lie at the root of the jibes from the news media.

"I'm 19 with 5 number one albums, 19 and I've seen the whole world. 19 and 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.

Bieber played a concert, apparently without incident, in Madrid on Thursday before moving on to Barcelona and other European cities later this month.