Demi Lovato has said she gets anxious when she is in a large crowd of people and is nervous about what might happen.

Speaking to Nylon magazine the Skyscraper singer explained, "Sometimes a fan will come up and automatically put their arms around me and I just shut down and start hyperventilating.

"I don't want to sound like a d*** or a diva, but I really do have anxiety problems. It I get stuck in a crowd, I'll start to think, 'Oh my God, I'm going to die. Something's going to go wrong and someone's going to stab me'."