London - Kate Winslet and Leonardo DiCaprio have their own "secret language".

The British actress has revealed the Revolutionary Road co-stars developed a special lingo to help get them through challenging filming scenes.

She said: "When we filmed difficult scenes we developed a secret language of our own. With our history we could do anything without feeling stupid."

The 33-year-old actress - who has remained close to Leonardo since they starred in the 1997 blockbuster Titanic - insists she trusts the 34-year-old actor implicitly, and would even let him hurt her if it improved a scene.

She said: "I would even let Leo physically harm me if it meant making a scene better, and I know he feels the same way.

"If we didn't have this rare friendship, I don't think we would be able to show that chemistry on screen."