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Getting a photo with a celebrity is a social media triumph, but a lot of famous people don't like being pounced on in public by fans wanting to get a snap with them.

has told fans on a number of occasions that he doesn't like having photos taken by fans (although sometimes is more than happy to pose with them).

Here's what happened to Justin and why other stars don't like being approached by fans with phones.

Justin recently confronted fans who tried to take photos of him outside his hotel in Melbourne.

"Look at your own respect level," he says in a video that one fan filmed of the encouter.

"Look at you. You make me sick."

It's not the first time JB has shared his dislike with fans asking for photos.

In 2016 he shared a post on Instagram saying it makes him feel like a "zoo animal."

"If you happen to see me out somewhere know that i'm not gonna take a picture," he wrote.

"It's gotten to the point that people won't even say hi to me or recognize me as a human, I feel like a zoo animal and I wanna be able to keep my sanity.

"I realize people will be disappointed but I don't owe anybody a picture."

Amy Schumer was so freaked out when a fan started taking photos of her, despite her asking him to stop, that she called time on letting any fan take a photo with her.

"Yes legally you are allowed to take a picture of me. But I was asking you to stop and saying no," she wrote on Instagram.

"I will not take pictures with people anymore and it's because of this dude in Greenville.

"This guy in front of his family just ran up next to me scared the s*** out of me, put a camera in my face."

"I asked him to stop and he said, 'no it's America and we paid for you.'"

Maisie Williams is thoroughly brilliant but catch her on the wrong day and she'll knock back your request for a selfie in a heartbeat.

"If I don’t want a picture one day, I don’t have a problem saying no," she told Nylon magazine in 2016.

"I know some people get really weird about that, like, ‘You’re so mean’, but if I was really in love with someone, I wouldn’t just want a picture. I
would want to hang out with them."

Maisie says that her fame makes some people feel like they already know her.

"Sometimes my fans say things like, 'That’s not Maisie,'" she added.

"I’m like, 'How do you know what is not me? One, I have never met you, and two, I am not yours.'"

Emma Watson has a strict no-selfies rule and that's down to her fears about her security.

"For me, it’s the difference between being able to have a life and not," she told Vanitiy Fair in 2017.

"If someone takes a photograph of me and posts it, within two seconds they’ve created a marker of exactly where I am within 10 meters."

"They can see what I’m wearing and who I’m with. I just can’t give that tracking data."

She's more than happy to chat about Hogwarts for as long as you like, however.

"I’ll say, ‘I will sit here and answer every single Harry Potter fandom question you have, but I just can’t do a picture."

The Hunger Games and X Men star says that as she has become more famous, she has struggled with how fans relate to her.

Which is why selfies are now off the table when fans see her out in public.

"I have just started becoming really rude and drawn into myself," she said in an interview with The Telegraph in 2016.

"I think that people think that we already are friends because I am famous and they feel like they already know me — but I don't know them.

"I have to protect my bubble, like, 'I have a weird job — don't let this be a reality.'"