Catherine Zeta-Jones has unveiled the secret to her marital bliss with husband MICHAEL DOUGLAS - they have separate bathrooms.

On 18 November (05), the couple will celebrate five years of marriage, and Welsh beauty Zeta-Jones believes one of the factors which has kept them going strong is their separate bathing quarters.

She says, "I don't want him to see how messy I am. Certain things should be private."

But the actress is quick to point out that she and her TRAFFIC co-star also enjoy more important aspects of their marriage: "We're good friends and we take care of each other... And we hang a lot and we're kind to each other.

"We spend so (much) time in our business being kind and polite to total strangers and sometimes the person who you love most and who's closest to you, you forget to be kind to."