Emma Watson

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."