Sandra Bullock watched in horror as an obsessed woman fan tried to kill her husband outside their home.

The Hollywood star and Jesse James were with James's tenyearold son when Marcia Valentine lay down in their driveway near Los Angeles.

James, 38 - who hosts Discovery Channel show Monster Garage - asked her to leave but she ignored him before getting into her silver Mercedes and repeatedly trying to mow him down.

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Real life drama for Jesse James and Sandra Bullock

The alleged attacker Marcia Valentine

Police in Orange County said Bullock, 42, and James's son Jesse Junior looked on in shock as Valentine "attempted three or four times to run Jesse James over" with her car.

Spokesman Jim Amormino added: "Valentine tried to kill him." He confirmed that Valentine has stalked Bullock in the past but did not know whether there were any restraining orders.

James was not hit during the alleged incident in Seal Beach, south of LA.

Sheriffs were called to the scene, but Valentine, from nearby Huntington Beach, drove off before they arrived.

She was arrested the following day after being spotted near Bullock's home and charged with assault with a deadly weapon. She was freed on £12,500 bail after a court date was set for May 22.

A spokesman for Bullock and James - who have been married for nearly two years - later said they were "fine".

Ironically, in her next film, the romantic comedy All About Steve, Bullock will play a crossword fanatic who stalks a TV cameraman.

Her character becomes convinced-that the newsman is the love of her life and criss-crosses the country following him to news hotspots.

Three years ago, Bullock was forced to obtain a restraining order against another stalker, Thomas Weldon.

He is now being treated in a psychiatric unit.

Bullock, who starred in Miss Congeniality and Crash, is one of the richest women in entertainment with a net worth of £40million.

The alleged incident took place outside the garage of Bullock's LA home (centre)