Sandra Bullock Sandra Bullock

Sandra Bullock left the Southern California house she shares with Jesse James just days before a report of infidelity by her husband surfaced, People reports.

The Oscar winner left on Monday, a source told the magazine. On Wednesday, In Touch printed a cover story featuring an interview with tattoo model Michelle "Bombshell" McGee, who claims to have had an 11-month long affair with James while Bullock was filming The Blind Side in Atlanta last year.

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Later on Wednesday, Bullock, 45, abruptly pulled out of the London premiere of The Blind Side

, due "to unforeseen personal reasons," according to a statement released by Warner Bros. U.K.Calls to Bullock's rep were not immediately returned.

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Bullock and James, 40, met in 2004 when she brought her godson for a tour of James' Discovery series Monster Garage. The pair married a year later.James was a fixture at his wife's side this award season as she picked up trophies at the Golden Globes, the Screen Actors Guild Awards and the Oscars for The Blind Side.