Xtra Factor's Caroline Flack Gets Online Knife Threat from Crazed Teenager

TV star Caroline Flack has alerted police after she received an online knife threat.

The Xtra Factor presenter, who had a brief fling with One Direction singer Harry Styles late last year, was sent a menacing photo on Twitter of a wide-eyed teenage girl holding a kitchen knife.

The 32-year-old star re-tweeted the disturbing image to the Metropolitan Police, adding the caption: "Acceptable tweet?"

Flack received a number of abusive messages from One Direction fans when she began dating 18-year-old Styles in November.

Just days ago a 39-year-old man was arrested after allegedly stalking her for more than three months.

He is said to have bombarded her with online messages and repeatedly turned up at her workplace.

A source told the Sun: "Caroline has been very worried. The man didn't seem like a normal fan and her people took it very seriously."