Jessie Jis reported to be "living in fear" of a deranged stalked who is thought to have broken her own leg to be more like the pop star.
The Sun claims that the teenager broke her limb so that she could wear a cast like Jessie - and then tracked down The Voice judge's private contact details and sent her a snap of it.
The girl, who cannot be named for legal reasons, is also alleged to have sent Jessie a message saying: "I will do anything to be just like you."
A source close to Jessie, 24, told the paper: "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."
Jessie is also claimed to have now stiffened up her security.

There was speculation recently that Simon Cowell might be planning to [uuid=7c7cd593-a33d-471d-9ba0-49598caa977e]poach Jessie for The X Factor[/uuid].