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.` "