Sugababes star Jade Ewen has stepped up her security after she was targeted by an obsessed female fan, according to a U.K. report.
The singer, who is dating EastEnders actor Ricky Norwood, is said to have been receiving explicit messages from a mystery female admirer - and the notes are leaving Ewen terrified.
A source tells Britain's Daily Star, "Jade has been forced to tighten her security after receiving a string of obscene messages.
"She is petrified and paranoid. She feels threatened. The messages are sickening."