Helen Mirren has filthy sense of humour

London: Dame Helen Mirren has a "filthy" sense of humour, her co-star Jason Bartha from "National Treasure: Book of Secrets" has said.

The 64-year-old actress stunned Bartha with her saucy quips and crude remarks when they worked together, but he admits he found her confidence "sexy", reports femalefirst.co.uk.

"Helen is the only person I`ve ever worked with that I`ve had a crush on. She`s so sexy, smart and talented and loves having fun but if I thought Catherine Zeta-Jones was bawdy, Helen was filthy," said the actor, who stars with Zeta-Jones in an upcoming movie "The Rebound".

"There was a scene where Nicolas Cage had to stick his hand in a crevasse and pull a lever and while he was doing it, she leaned over and said something so suggestive, all I could do was look at her in shock and say, `Dame Helen!`."

"But she loves having fun and the fact she`s so comfortable in her own skin is what makes her so attractive," he added.