Justin Bieber's Biggest Celeb Beefs

Though Justin Bieber's latest altercation with Orlando Bloom in Ibiza -- reportedly over Bloom's ex-wife Miranda Kerr -- shocked plenty of people Wednesday, it's hardly Bieber's first celebrity beef.

Let's take a look back at Bieber's most famous adversaries!

It all started when Seth Rogen called Bieber a "piece of s**t" on Twitter following the Baby singer's legal troubles in Miami, but escalated when Rogen took to The Howard Stern Show to explain the two's hilarious in-person encounters.

"Justin Bieber had ... No humility, no awareness, no sense that, 'Since I appeal to young, young people, maybe a grown man who works in comedy doesn’t give a sh*t about me? And maybe I should act in such a way that maybe this isn't the greatest experience of his f*cking life to meet me?' And I just remember thinking he's a piece of sh*t," he told Howard Stern in May.

Bieber later responded via Twitter.

"Seth Rogan sorry I didnt bow down when I asked 2 meet u was probably a bit shy and didn't want to be over the top but still. love ur movies," he tweeted. 

After TMZ caught Black Keys' drummer Patrick Carney saying that Bieber shouldn't be upset for not scoring a 2013 Grammy nomination because "Grammys are for music, not for the money, and he's making a lot of money," Bieber unleashed the Beliebers on him via Twitter.

"The black keys drummer should be slapped around haha," he tweeted.

"I mean, Justin Bieber is a f*cking moron," Carney later told Rolling Stone. "And that's the gist of what I was saying. And then he goes and says I should be slapped? Honestly, I feel bad for him."

Though Taylor Swift never publicly dissed Bieber, her epic eyeroll at the 2013 Billboard Music Awards when he and on-again/off-again girlfriend Selena Gomez embraced said it all. 

CSI star Marg Helgenberger wasn't impressed when Bieber guest starred on the hit CBS show, calling him a "brat" in an interview with French radio show Le Grand Direct des Medias in May 2011. "He locked one of the producers in the closet," she recalled, "and he put his fist through a cake that was on the craft services table."

Bieber's response via Twitter?

"It's kinda lame when someone you met briefly and never worked with comments on you. I will continue to wish them luck and be kind."

Drake & Josh star Drake Bell continuously provokes Beliebers on Twitter by throwing jabs at Bieber, and while there are too many to mention, one reads, "Justin Bieber is 5'6" now I understand why you guys love him!! He's the same height as all you 12 year olds! I totally get it now sorry guys."

After all the hate, Bieber finally responded to Bell in April, crashing his album release party. He later posted -- then deleted -- a picture of Bell with the caption, "Why is @justinbieber sprinter vas getting more attention than my album release party?"

Sharon Osbourne got candid about her thoughts on Bieber at the National Radio Conference in Sydney in October 2012, calling him "a little guy." "For me, Justin is ... I've met him, I've worked with him, I did a TV commercial with him. He's a really great little guy. But that’s his problem. He’s a little guy. His fans are growing up, they're eighteen, nineteen year olds now ... you know they're young women. And he still looks like that little boy."

This time around, Bieber's response was actually tame for his standards, simply tweeting, "Doubt me .. I like it." He later followed it up with a link to his Beauty and the Beat video with Nicki Minaj, writing, "Not worried Sharon."