'Bieber fever' has reached a whole new level in recent weeks, resulting in concerts being cancelled, Justin having his hat stolen, and even his mum being knocked over.
Pop and film stars have always had dedicated fans, but do you think people are getting a bit too obsessed?
Maybe you're a Justin mega-fan and understand Bieber Fever, or do you think people should get a grip and not be so obsessive?
What lengths would you go to to meet, or catch a glimpse of, your own idol in real-life?
Unfortunately this topic is now closed but there are Comments pages on other subjects on the main Chat index.
"Bieber fever has gone TOO far! I mean, have you heard him live? I am sure he is nice but he is just far too materialistic! He needs a reality check, it's not all about him and his silly hats!"
Heledd, 13, Powys, Wales
"I think Bieber fever has gone a bit too far because he hasn't even released a lot of songs to listen to!"
Troy, 11, Doncaster, England
"Why are people mobbing him? He's just annoying. There shouldn't be a Bieber anything."
Matt, 11, Wirral, England
"I love him. Maybe some people are a bit too over the top. I wouldn't knock down his mum but I LOVE him."
Bethan, 13, Swansea, Wales
"I think it's gone way too far in my opinion I don't like his singing, but stealing his stuff and pushing his mum over is really bad."
Jane, 11, Norwich, England
"I think Bieber fever has gone too far, he's a good singer but people should just get a grip. I did already say he's only a singer."
Vicki, 12, Skelton, England
"I think people have gone too far! Justin just wanted to be famous and he got it but he didn't think it would go this bad! I feel sorry for Justin! and I love him to bits!"
Kuljeet, 11, London, England
"YES! Bieber fever has gone way too far. Pushing over his mum! Who did that!? Calm down people he is only a boy.... who can sing."
Angharad, 13, Wales
"I don't think Bieber fever has gone too far. I love Justin and I have BIEBER FEVER! I am a BELIEBER! Some fans may go a little over the top, but that's not Justin's fault."
Jessica, 14, California, USA
"I think Bieber fever should calm down. We all want to see him but this has got out of hand."
Danni, 13, London, England
"I don't think that it's Justin's fault. I think it's the fans fault for going OVER THE TOP and I'm on Justin's side for this!"
Amy, 10, Ayrshire, Scotland
"Give the boy a break. He's only 16 and he's not even that great a singer."
Christina, 12, Fife, Scotland
"Seriously people I CAN'T believe this! OK he's a good singer and he's famous, but you don't need to push his mum or steal some stupid hat. PEOPLE GIVE HIM SPACE!!"
Jem, 10, Herefordshire, England
"I think he has just gone too far! A lady even stole his hat. She just stole his hat!!"
Olivia, 10, Kent, England
"I think it has gone too far, what is the fascination about him?!"
Katie, 14, Cwmbran, Wales
"It's not Justin's fault his mum got knocked over and his hat stolen! Bieber Fever has gone too far. He is an amazing singer and it's just not fair on him. His fans are just too obsessed and they are the stupid ones! Poor Justin!"
Katy, 9, Luton, England
"I personally don't like him! I think people should just chill! He's a normal person! If you got mobbed in a street how would YOU feel?!"
Ellie, 11, UK
"Take a chill pill, fans. He isn't even that special, certainly not a legend. Sorry Justin and fans of you!"
Harriet, 14, Southampton, England
"He is brilliant, but fans need to calm down. Yes, be excited - he's a mega star, but some fans just go way too far!"
Paige, 11, London, England
"Things have gone way too far this time. If you want to meet him and for him to not cancel his concerts, then don't steal his hat and knock down is mum!"
Olivia, 11, Glamorgan, Wales
"I think fans are a bit too obsessed because, even though he is a brill singer, do they really need to do this? I'm not a JB fan myself, but they need to find a cure to the Bieber Fever and it better be fast."
Rikki, 12, Somerset, England
"I think people are going too crazy about this whole thing, and I think it should stop because Justin performs for all his fans, but then people just go and take his things and knock his mum over!"
Zara, 11, London, England
"I think Justin Bieber should just let his fans be fans!"
Annie, 10, Newcastle, England
"I think Justin Bieber is really cool and has got a great voice but his fans need to calm down!!"
Jasmine, 9, Barry, Wales
"Oh, of course it is, in fact there are people in my school that frequently keep banging on about it!"
Josh, 12, Great Yarmouth, England
"I think fans have gone too far. I mean, stealing hats and shoving people to get to him! Things are just getting a little to out of hand."
Callum, 11, Shetland, Scotland
"I don't think people should be that obsessed, it's silly."
Kate, 11, Somerset, England
"I think JB is amazing but the Bieber Fever has gone too far. I think fans should lie low!!"
Nicole, 10, Wirral, England
"He is wonderful! I do understand Bieber fever, because I have it, but I do think his Mum being knocked over is just ridiculous! Let him breathe, people!"
Olivia, 11, Basingstoke, England
"I don't think Bieber Fever has gone too far because Justin Bieber is so cool, he deserves the attention!"
Ashlyn, 10, Basingstoke, England
"I think Justin Bieber fans should calm down a bit, as I was watching the news the other day and I saw girls getting crushed and badly injured at Justin Bieber concerts! It has gone too far."
Jade, 11, Plymouth, England
"Urgh. I don't understand what is so good about him!"
Richard, 11, Maidstone, England
"I adore Justin Bieber and I have got the Bieber Fever, but I can control myself. The people that go mad are ruining it! I don't agree with people that say they have the Bieber Fever just because he's cute."
Bethany, 13, Brittany, France
"Well I think Justin is amazing and it would be amazing to meet him, but knocking down his mum and mobbing him is just over the top!"
Amaal, 12, Liverpool, England
"I feel sorry for Justin, because of all this Bieber Fever stuff. I don't see why so many people idolize him, he's a terrible singer to be honest."
Justine, 11, Co. Louth, Ireland
"I think its ridiculous how crazy girls go for Bieber! I mean, he's just a singer, a really good singer, but stealing his hat is going too far isn't it?"
Mary, 13, London, England
"It has got a bit out of hand, all the girls are obsessed with him. The fans should keep it down a bit."
Sangrila, 11, Canterbury, England
"I think it is just silly and I do not see the fascination about him! It has gone TOO far!"
Beth, 14, Aberdeen, Scotland
"I feel sorry for Justin because he is under pressure now. His fans are the people who help him achieve his dreams, BUT if that means they are putting him and his family in danger. Besides, Justin won't LOVE anyone who steals his hat and pushes his mum!"
Rosie, 13, Sussex, England
"I love Justin Bieber, but people shouldn't be soooo obsessed about him. He is a normal person like everyone else in this world and I bet there are thousands of other people like him, maybe even better."
Alice, 13, London, England
"I think Justin Bieber is the best teen sensation but seriously, the over obsessiveness is seriously too much. Justin Bieber's mum could have been really hurt. I love Justin Bieber but you don't see me stealing his hats or knocking over his mum."
Hannah, 12, Kidderminster, England
"Well I think everyone should calm down, he's just a 16-year-old guy that sings and I feel sorry for him too! EVERYONE JUST GIVE HIM A BREAK, OK!!"
Sima, 12, Doncaster, England
"I'm like the biggest fan but I would never steal his hat or push his mum over! I would treat him as a normal human, not taking him for granted just because he is famous."
Danielle, 14, Wrexham, Wales
"It's his own fault. If he wasn't a singer he wouldn't have had his hat stolen or his mum knocked down."
Tony, 11, London, England
"I think he is amazing. I just think the boys are jealous."
Maise, 12, London, England
"I'm fed up of everyone going on about Justin Bieber. It's really annoying. In a couple of years he's going to be nothing!"
Tyler, 13, Derbyshire, England
"I think people should just give him some space. He is just a person and theft isn't right, no matter who it is!"
Emily, 12, Berkshire, England
"I understand that everyone loves Justin Bieber but they seriously need to cool down. After all, he is just a normal person like us, who sings well."
Jegasaini, 13, London, England
"I love Justin Bieber but his mum getting pushed and someone stealing his hat? I mean, come on! Everyone is excited but people should really calm down now."
Akruti, 13, London, England
"I know what everyone means by Bieber fever going too far. I mean, come on people! He's just some teenage singer, not some sort of legend! Stealing his hat and knocking his mum over is probably just to get attention."
Jamie, 10, Bristol, England
"I am a Justin Bieber fan but I think it's getting out of line to steal his items and push his mum over. If that happened to my mum I would not ever sing again because my mum is someone I think is so much more important than fans who shove and steal."
Minnie, 11, London, England
"I am a big fan of Bieber but I wouldn't go that far, it's just uncivilised."
Graie, 11, York, England
"I don't get it. He's a teenage guy and, sure, he sings really well but what's the appeal in knocking his mum over and stealing his hat?!"
Abbie, 14, Dublin, Ireland
"I think it has gone too far. I don't know why people are all over this boy. He is a bad singer and I don't know why people think he is amazing."
Louise, 9, Merseyside, England
"I don't think he is worth all the attention. Bieber fever has gone WAY too far."
Issy, 11, Swindon, England
"I know I like him but it has gone too far. I am so mad because they knocked over his poor mom."
Lia, 10, Cork, Ireland
"I love Justin Bieber a lot but people need to leave him alone! They are going too crazy. If you want Justin Bieber then I suggest you don't go crazy because his concerts are sometimes being cancelled. Why would you steal his hat? You would hate it if your hat was stolen! He's not going to like you if you knock his mother over either!"
Emily, 11, Glamorgan, Wales
"He is rubbish. Fans should just give him a break because he can't sing and doesn't deserve all the attention."
Aisa, 14, London, England
"I love him and agree with all of this Bieber fever. If you are a fan of him you might as well show it!"
Francesca, 12, Leicester, England
"I love Justin Bieber and I think his fans should be able to do what ever they want! GO BIEBER FEVER!"
Emily, 14, Monmouthshire, Wales
"I think when Justin Bieber has a concert there should a limit of people who are allowed to go to the front. The crowd should also calm down a bit!"
Georgina, 11, Belgium
"I think it has gone way too far. There are much better singers out their like Dizzie and Cheryl so stop making a big fuss!"
Alyssa, 9, Ipswich, England
"I LOVE Justin Bieber but the fans should calm down because if you keep on being crazy he won't do any more concerts."
Fiza, 9, Manchester, England
"I think people should calm down but I can't blame them for pushing as he is a total legend in the making."
Parris, 14, Essex, England
"I think he is getting a bit bored of screaming girls so they should give him space."
Katie, 11, Worcestershire, England
"I think people should chill out because you don't know what is going on in his mind, plus it is going too far!"
Sameera, 12, Bedfordshire, England
"I think fans have seriously got to calm themselves down, they've stolen his hat, knocked down his mum. Isn't that enough?"
Tabbz, 12, Middlesbrough, England
"I think it's gone too far. Justin might just want to be famous without girls trying to get his attention. I'm a Justin Bieber fan, but I DO NOT shout in his face."
Danielle, 12, London, England
"Yes, he's such a show off!"
Sam, 10, London, England
"Justin Bieber is a very good singer, but if you want him to keep going out and performing you have got to give him some space!!"
Hannah, 11, Devon, England
"I love Justin Bieber but to be honest some girls are WAY too obsessed!"
Helena, 13, Bedford, England
"Personally I don't get what's so special about Justin Bieber. He is just another teen star. I think fans should chill as he must be under A LOT of pressure and he is only 16."
Hanna, 11, London, England
"Liking him and his music is one thing, but mobbing him? Stealing his hat? It has definitely got out of hand!"
Lizzie, 12, Cambridge, England
"I'm a huge fan of Justin! Some of my friends like him too, but others don't understand what the big deal is! I think that he is great and deserves the attention, but maybe just a little less!"
Harriet, 12, England
"Seriously, Bieber just got famous because he was lucky! He isn't even talented. There are much better singers out there so don't fuss over him, he isn't worth it."
Hazel, 12, London, England
"I think that girls just need to chill. I like Justin Bieber's music but I think some girls just go too far!"
Shauna, 11, Glasgow, Scotland
"I love Justin Bieber. He is worth the attention and should be proud of what he has done at his age."
Imogen, 14, Cheshire, England
"Bieber Fever has NOT gone too far, it is probably going to go further! I can't blame people, he's gorgeous!"
Daisy, 14, Brighton, England
"I love Justin Bieber, but I think the other fans have got a bit crazy!!"
Rosie, 14, Nottingham, England
"Bieber Fever has gone too far, there is no point pushing his mum over and crushing each other just to see him! Girls will end up forcing him to cancel all of his tours, so they wont be able to see him then."
Callum, 11, Staffordshire, England
"I think Bieber Fever has gone tooooooooo far and fans should chill!!"
Clare, 10, Airdrie, Scotland
"I'm obsessed with Justin Bieber but it was really unfair someone stole his hat and I'm sorry to hear about his mum being knocked over. It just proves he's got millions of fans!"
Lydia, 13, Lancashire, England
"I have the Bieber Fever but I think it's just so mean that someone knocked his mum over and stole his hat. Poor Justin."
Georgia, 12, Nottingham, England
"I think Bieber Fever has not gone too far but taking his hat is just wrong!"
Emilie, 14, Shrewsbury, England
"I am a big fan of Justin Bieber but people are too excited whenever they see or hear him."
Roslyn, 10, Slough, England
"It has definitely gone way too far! The fans need to calm down. I think they all have huge crushes on him but haven't realised that if you start screaming and yelling at somebody they're going to have nightmares about you!"
Joanne, 10, Manchester, England
"What can I say? It has gone too far. He is right, safety is important, even with millions of fans. You need to calm down. We can still have fun, just be careful."
Harbir, 13, Slough, England
"I think girls should calm down. He is just a singer and knocking down his mum is too far just to see him."
Kelly, 13, London, England
"People have to calm down. There are plenty of people that love him too, just not that much!"
Leah, 13, Birmingham, England
"Everyone should cool down about him, he's only a singer."
Jake, 11, Staffordshire, England
"I think they are getting too crazy. I liked Justin Bieber when nobody knew about him but now I'm kind of getting bored of him."
Emma, 13, London, England
"I personally think he's rubbish and I'm fed up of people talking about him so much at school. One boy isn't worth the risk of getting hurt or hurting others."
Sumina, 13, London, England
"I think people are getting really hyperactive and starting to go over the top a bit and they have become really obsessed over him."
Faduma, 11, London, England
"It has not gone too far, I would LOVE to meet him."
Joe, 13, Liverpool, England
"Personally I think that Justin Bieber fever has gone too far but on the other hand his songs are awesome!"
Rubie, 12, London, England
"It has gone too far. Justin Bieber fans must not get all crazy about him- Bieber fever has really reached a new level."
Charlotte, 13, Bury St Edmunds, England
"I think he is rubbish. Please stop posting about him Newsround! He isn't worth the attention!"
Matthew, 14, Bolton, England
"The fans should definitely calm down and stop scaring him. There will be plenty more concerts and chances to see the one and only Justin Bieber!"
Nada, 13, Manchester, England