Hollywood actor George Clooney says getting married to Amal Alamuddin has "changed everything" for him.

The 54-year-old actor, to be seen in "Tomorrowland", married with the 37-year-old lawyer in September last year.

"All I know is that it sort of changed everything in terms of what I thought my future - my personal future - was going to be. But I've always been an optimist about the world. I wasn't always completely optimistic about how it was going to work out personally for me. But now I am," Clooney told people.com.

Clooney's comments come shortly after he said one of Alamuddin's most attractive character traits is her compassion for other people.

He said: "She's an amazing human being. And she's caring. And she also happens to be one of the smartest people I've ever met. And she's got a great sense of humour."