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It's an understatement to say that Justin Bieber has had a rough couple of weeks. But, through it all the concert cancellations and late starts, the paparazzi battles and the nightclub misunderstandings he's tried to keep his head up and stay positive.

On Thursday (March 14) though, the singer had had enough. In a 300-word rant posted on his Instagram account, Bieber lashed out at what he said were malicious lies in the press about him, his family, his career and his health.

"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," wrote Bieber under a black-and-white picture of him greeting a huge group of fans. (The post appeared to have been taken down at press time, less than two hours after it first went up. However, Bieber reposted it at 12:15 p.m. ET with additions and omissions.)

"Saying I'm going to rehab and how my family is disappointed in me. My family is beyond proud, and nothing's been said by them, my grandparents wouldn't know how to reach to press even of they did want to so that was a lie and rehab c'mon." The former was seemingly a response to a tabloid report in which Bieber's grandparents reportedly expressed their disappointment in his recent actions and concerns about the crew he's been running with. While the allegations about a trip to rehab have gotten less attention, they clearly upset the star, who recently celebrated his 19th birthday.

"If anyone believes I need rehab that's their own stupidity," he wrote. "LOL. 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."

The self-defense came a few days after Bieber's longtime manager, Scooter Braun, spoke out to refute the allegations. "There's nothing wrong with him," Braun told E! News. "He's in a great place." Braun joined One Direction and Will Smith and Jada Pinkett Smith in supporting their pal.

A spokesperson for Bieber has no comment.

Bieber said he is secure in his talent level and assured his legion of Beliebers that he has his head on straight.

"I know who I am and I know who I'm not," he wrote. "My message is to believe. My albums could be about anything but my messages have been to never say never and believe, not to believe in me, but to believe in yourself .. I honestly don't care if you don't believe in me because I believe in me, and look where that's gotten me so far ... I'm writing this with a smile on my face and love in my heart. Letting u know first hand how I feel rather than have these story linger. I'm a good person with a big heart. And don't think I deserve all of this negative press I've worked my ass off to get where I am and my hard work doesn't stop here. I'm growing up finding myself while having people watch me and criticise me everyday I think I'm doing pretty damn good."

The post ended with a not-so-subtle jab at the tabloid press, as well as another young star who has had to deal with her fair share of distressing headlines. "And to those comparing me to Lindsey Lohan," he wrote. "Look at her 2012 tax statements ;)"

The rest is here:
Justin Bieber Slams Press Reports In Instagram Rant: 'I Know Who I Am'