A Jessie J fan has reportedly broke her own leg to look like the singer.

The teenager - who cannot be named for legal reasons - is believed to have inflicted the injury so she could wear a cast like the 'Price Tag' hitmaker - who broke her foot after falling off stage last year.

According to The Sun newspaper, the girl then sent Jessie a picture of the broken limb along with messages like: ''I will do anything to be just like you.''

Fearing for her safety, 'The Voice' judge is now said to stepped up security.

A source said: ''She's horrified this happened. Jessie's a really, really sensitive and kind girl who loves keeping in touch with her fans.

''But this incident was just too much for her and she ended up getting really frightened and upset.

''She was sad that a fan hurt herself to look like her -- but she was also scared for her own safety.

''Now Jessie's on 'The Voice' and getting bigger and bigger, she knows it is time to review security and the risks to her.

''She loves her fans but these things are unavoidable in this day and age. It happens to all pop stars as they become bigger. It's one of the downfalls of fame. Jessie would prefer it wasn't this way.''

A spokesman for the singer - who was warned she would never be able to wear heels again without pain following the accident - refused to comment on the story.