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.

"I think it was the stupidest thing I've done in the whole relationship. It was terrible. I inflicted tremendous pain on Maria and unbelievable pain on the kids," he said in an interview with 60 Minutes, set to air this Sunday.

The former Governor of California is currently promoting his autobiography, Total Recall: My Unbelievably True Life Story and though he says Maria hasn't read the tell-all book, she wishes him the best. "I think that Maria is, you know, wishing me well in everything I do."

Mildred - who worked for Arnold's family for 20 years - had listed her ex-husband's name on Joseph's birth certificate and has previously said she only knew for certain who the boy's father was when he began to look increasingly like the actor. The affair was only revealed in May last year, days after Arnold and Maria announced they were separating after 25 years of marriage.