The separation of the pair became public at the end of October when tabloid newspapers revealed photographs of the actor with another woman, but court documents reveal that they separated on May 28 of last year.
TMZ reports that family law court documents state that the marriage broke down due to "irreconcilable differences".
The 46-year-old is said to be seeking joint custody of his children whose ages range from six to 21 despite his ex-wife seeking sole custody with visitation rights for McGregor.
