Actress Anna Friel has revealed that she is too "old-fashioned" to ask a man to marry her.

According InStyle magazine, the 'Pushing Daisies' star said of her relationship with actor David Thewlis: "Our relationship is not conventional."

"He's 13 years older than me. We have our own separate properties and we're not married."

"He's my best friend. We have great conversations."

"I can ask him about anything and he'll always have the answer. He's smart and talented, two things that I'm attracted to."

"He's never asked me to marry him. It's never come up. I'm too old-fashioned to ask him."

"No way does a woman ask a man. I know some people do, but I couldn't."

The couple have a 4-year-old daughter called Gracie.