The actress, who already has two children with ex-husband; a daughter with Jim Threapleton and a son with Sam Mendes.
She is currently dating Ned Rocknroll, nephew of Sir Richard Branson.
She said even though she never failed in romance, he still believes in marriage.
"I still believe in the beauty of commitment between you and other people, in the end, marriage is an expression of that commitment," he said.
"Living together with someone is always a challenge, but you hope to find someone who can spend a lifetime with you."
Kate was happy with its current status. The British felt pretty lucky to get a lot of support from the people around him.
