Footage shows Justin Bieber being smacked down in fist fight.

Poor Justin Bieber.

If that thought had even crossed my a year ago I would have had to seriously check myself, but the Biebs has done some serious Britney Spears-level rework on his image over the last 12 months. So much so I was even starting to like the guy who was once the centre of a campaign to be extradited back to Canada from the States.

And now he’s gone and got himself into a fist fight.

Damnit, Bieber. If there’s one thing that could ever make you drop so far down in my list of the people I barely tolerate, it’s physical violence. And no, not even the sweet, catchy lyrics of your hit ‘Sorry’ can save you.

Notorious celebrity gossip site, TMZ has obtained 30 seconds of video footage from the fight which appears to be from a bystander's Snapchat.

The footage shows newly-bleached haired Bieber take a punch at a man who instantly retaliates. The man, who towered over Bieber's 1.75m frame, then threw the 22-year-old to the ground in the doors of Cleveland Hotel.

Bieber appeared to walk away unscathed. The same could not be said for his ego.

While the reason for the brawl hasn't been confirmed, here are a couple we think might be why:

 - The bleach went to his brain. 

 - It was too late for his attacker to say sorry.

 - The man accused him of stuffing his under wear for the Calvin Klein shoot, for the 328th time. 

 - He was mistaken for Miley Cyrus.

 - He finally saw the picture of Selena Gomez getting cosy with Orlando Bloom. 

 - Someone didn't answer him when he said 'What do you mean?'

Yep, all plausible. But the most likely reason that is being reported is Biebs took a pummelling over an autograph.

Bieber publicly took to his Instagram account a month ago to say he would no longer be taking photos with fans.

A photo posted by Justin Bieber (@justinbieber) on May 10, 2016 at 3:15pm PDT

In his post he writes,

“If you happen to see me out somewhere know that I’m not gonna [sic] take a picture I’m done taking pictures.

“It has gotten to the point that people won’t even say hit to me or recognize me as a human, I feel like a zoo animal, and I wanna [sic] be able to keep my sanity.

“I realize people will be disappointed but I don’t owe anybody a picture. [A]nd people who say “but I bought ur album” know that you got my album and you what you for AN ALBUM. It doesn’t say in fine print whenever you see me you also get a photo. Justin Bieber”

Bieber had spent the night at the NBA finals and was swamped by fans asking for photos.

Sorry Biebs, look like you should take the the advice 'pick on someone your own size' a bit more literally.