Catherine Zeta-Jones joked that 'saucy' Prince Charles had got a little too familiar with her boobs while pinning a medal on her chest when she appeared on the David Letterman show last night.

Shown a picture of her being presented with the award, Catherine said: ‘Look at his hands! Check out his hands, I dunno. I love the royal family but he is being a little saucy."

Letterman asked: "Is that to do with the award?"

She replied: "No. I just think that’s my breast actually."

Letterman asked her what the award meant, "You don't have to pay taxes?"

Miss Zeta-Jones, 43, replied: "I am a Commander of the British Empire, and basically that entitles me to David Letterman getting on his knees every time I stand."

Zeta-Jones was promoting her latest film, Broken City, in which she is cast the wife of a "corrupt beyond belief" New York Mayor, played by Russell Crowe.

"We had Thanksgiving dinner with Mayor Bloomberg. We went to Bermuda and he asked me about the part," she said. "I said I am married to the Mayor of New York. This was over turkey and cranberry sauce. I told him Russell’s character was corrupt beyond belief, and he wants to kill me and the Mayor turns to me and says “That would work”.