It's no secret that JUSTIN BIEBER has been going through some challenging times lately. And yesterday, he decided to fight back.
He posted a long message on Instagram, complaining about all the LIES that the media is telling about him, like how he needs rehab and how his family is disappointed in him.
He also noted that he's already had five #1 albums and seen the whole world. He added, quote, "I'm 19 and it must be scary to some people to think that this is just the beginning."
He said he's a "good person" with a good heart" who's "worked [his] ass off" to get where he is . . . and he doesn't think he deserves the negative press.
And that's all well and good, but then he ended the letter by taking a jab at LINDSAY LOHAN.
He said, quote, "And to those comparing me to Lindsay Lohan, look at her 2012 tax statements ;)"
It sounds like Justin didn't mean to attack Lindsay . . . he just thought he was being funny. But he quickly realized he messed up and removed that part of the post.
He said, quote, "My post was only up for a few minutes  but I realized right away that what I said at the end was wrong and distracted from what I was trying to say.
"I immediately deleted it and rewrote it so it would show what I was really feeling and those words are up now."
We don't know how Lindsay feels about Justin's post . . . or if she's even seen it. But according to TMZ, "sources" say she HAS seen it, and she's NOT happy.
She thinks it was "senseless and mean", and she doesn't know why Justin targeted her, because they've never had a problem.