Naughty Kate Middleton driving while talking on her mobile phone

It's hardly behaviour befitting of the girlfriend to the heir to the throne.

But Kate Middleton has come under fire after being caught on camera using her mobile phone while driving.

The girlfriend of heir to the throne Prince William was seen behind the wheel of her Audi A3 hatchback with her phone clamped to her ear, along a country lane.

Lawbreaker: Kate Middleton was allegedly seen driving down a country lane while talking on her mobile phone

This kind of driving offence usually carries a fine of £60 and three penalty points.

And if someone had been injured, the 26-year-old could even have faced a jail term.

A spokesman for the Royal Society for the Prevention of Accidents, said: 'Using a mobile phone while driving is extremely dangerous and has cost numerous lives.

'Drivers are four times more likely to crash if they are on their mobiles.'

The girlfriend of the heir to the throne has come under fire from safety experts

A bystander told the Sun that Kate, who has dated Prince William on and off since University, said she was 'going quite quickly.

'And you could clearly see she was on the phone.'

Last year it was made illegal to use a mobile without a hands-free kit while at the wheel of a car.