Several hundred guests including Jamie Lee Curtis, William Shatner and Regina King attended the ceremony held at a rented Californian ranch near Santa Barbara, according the TV show Entertainment Tonight and People magazine.
Bullock and James, who hosts Monster Garage on the Discovery Channel, arrived in a red monster truck, while many guests were unaware they were attending a wedding until the last minute--they were told it was a party to celebrate Bullock's 41st birthday.
Premature media reports suggested the actress wed James on Friday after photographs of a series marquees erected at the ranch were published.
However, Bullock claimed the celebration was being held to mark her 41st Birthday--even though her special day isn't until July 26--but her claim was a smokescreen to hide her imminent nuptials from the media's attention.
This is the first time Bullock has been married despite an engagement to actor Tate Donovan and a romance with Matthew McConaughey, while James, 35, has been married twice before and has three children with his ex-wives.
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