Arnie: Affair was 'terrible'

Arnold Schwarzenegger admits having an affair with his housekeeper was the "stupidest thing" he ever did in his marriage.

The 'Expendables 2' star accepts he caused great pain to his now estranged wife Maria Shriver and their four children with his illicit romance, which led to Mildred Beana giving birth to his son Joseph 14 years ago.