Megan Fox is a natural at parenting.

The 24-year-old actress - who married long-term boyfriend Brian Austin Green in a secret ceremony in Hawaii in June - is stepmother to the actor's eight-year-old son Kassius and her spouse is delighted by how well she copes with the youngster.

Brian, 37, said: "She is absolutely my better half in parenting. She just gets it. It's instinctual for her. She loves my son, Kassius. And from the time we started dating-you know, she was 18-she stepped in and took control. It's unbelievable."

Brian - who had Kassius with former girlfriend Vanessa Marcil - doesn't think the 13-year age gap between the couple is an issue because they have always got on so well.

He told Details magazine: "When we met, I had just separated from Kassius' mom and a relationship was the last thing on my mind. It's not something I ever thought would be serious. But she brought out parts of me that I had lost in my last relationship. Megan was a big part of boosting my confidence. And at the same time, I was somebody responsible and grounded for her to be around. We just matched."

The former 'Beverly Hills 90210' star insists he isn't jealous of his wife's movie career, admitting that he is happy for the 'Transformers' star to be the main breadwinner.

He explained: "I know the normal male thing is the man works and is successful and brings home the pay cheque. I don't know who set it up, but it's what people expect. I just don't care. I hated being famous during '90210'. I'm not an extrovert. I'm 37. I have a beautiful wife. I have an amazing eight-year-old son. I love acting, but this is just my job."

However, Brian revealed that if his career did take off again, his wife would be happy to take a break from Hollywood.

He said: "F**k, next year I could book some crazy movie that blows up and things could shift completely. And I guarantee you at that point she'll say, 'F**k, thank God. You go do all that s**t now. I'm sick of it.' "