Jordin Sparks has stepped up her security arrangements after receiving a series of worrying letters from a "creepy" fan.

The No Air hit-maker was in London when fellow singer Leona Lewis was assaulted by a man at a book signing in October, and admits the incident made her more aware of potential threats.

And Sparks reveals she has one follower in particular who has convinced her she needs to tighten her security arrangements.

She tells British newspaper Metro, "I was in London when that happened to Leona Lewis. What's wrong with people? I've never been physically harmed but there is one guy we're suspicious of. I think he has issues."

"He's proposed marriage to me in letters several times and he's sent me a cell phone to call him on. It was very creepy. My security people are keeping their eyes open."

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(This news article provided by World Entertainment News Network)