Anne Hathaway thinks marriage has changed her.

The 32-year-old Hollywood star married Adam Shulman two years ago after almost four years of dating and although she's previously said it hasn't changed their relationship, she now concedes things are different.

The 'Interstellar' actress told the 'Today' show: ''We both talked about it before hand and how it wasn't going to change anything.

''But something shifts and I don't know what it is. And I didn't realise I was keeping a part of myself protected and it's kind of all on the line now.

''I'm his and he's mine, Oh God stop it... so cheesy excuse me.''

Anne recently said there is not set formula to making a relationship work.

Asked about the keys to a happy marriage, Anne replied: ''There is none.

''Every marriage is unique because every person that is married is unique. It doesn't even have to be marriage, it could be just a relationship. One thing that works for one couple doesn't necessarily work for another couple.

''I think the most important thing is to bring your most honest and authentic self with the other person - that's what we do, and so far it's working out really well.''