Bullock canceled her appearance at the London premiere of "The Blind Side," citing personal issues. The 45-year-old actress says in a statement released by Warner Bros. UK that she can't attend the event for "unforeseen personal reasons." She goes on to apologize for canceling her commitment and to thank people for their support of the film. The London premiere is scheduled for Tuesday.
Michelle "Bombshell" McGee tells In Touch magazine she had a nearly year-long affair with James while the actress was out of town filming.
The tattoo model claims she thought the pair was separated at the time. Bullock and James have been married nearly five years.
People.com said Bullock had left the couple's home just days before a report of infidelity by her husband surfaced.
The couple were last seen together publicly at the Oscars. While Bullock didn't specifically thank James in her acceptance speech for best actress, they walked hand-in-hand on the red carpet, and he attended numerous award shows with her leading up to the Oscars.
The Associated Press contributed to this report.