McGregor, 35, and his wife, Mavrakis, 39, are already the parents of two children. Mavrakis, who was born in France, met the star on the set of the British television series Kavanagh QC. The couple has been married for 11 years.
In 2004, McGregor and his best friend took a three-month motorcycle journey as part of a Bravo television series. Mongolia was one of the places that the men visited during their 20,000 kilometer trek. Before the trip, McGregor said that his wife and children "understand and are fully behind us, (though) I think if the whole thing was called off tomorrow they would probably be delighted."