Source: Sandra Bullock Has Left the Family Home

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By Mike Fleeman

Update Thursday March 18, 2010 09:40 AM EDT
Originally posted Wednesday March 17, 2010 09:40 PM EDT

Sandra Bullock and Jesse James are not living under the same roof right now.

The actress left the Southern California house she shares with James just days before a report of infidelity by her husband surfaced, a source tells PEOPLE.

PHOTOS: Sandra & Jesse: Scenes from a Marriage

Bullock, 45, left on Monday, the source says. Bullock, who won her first Oscar – a Best Actress award – for The Blind Side on March 7, also abruptly canceled a trip to Europe for the London premiere of the film.

Bullock and James, 40, met in 2004 during a tour of the set of the Discovery Channel's Monster Garage, which James starred in.

The couple married a year later, in July 2005 in a sunset ceremony at a ranch north of Santa Barbara attended by 300 guests.