Actress Katherine Heigl has dismissed rumours she is hard to work with on set.

The Knocked Up star was the target of a feature by The Hollywood Reporter last year (13) suggesting she and her producer/manager mother Nancy Heigl are "difficult" to work with.

The actress was promoting her new show State of Affairs at the Television Critics Association press tour on Sunday (13Jul14) when she was asked about the allegation, and she insisted she is not unpleasant to her co-stars and crew.

Heigl says, "I certainly don't see myself as being difficult; I would never intend to be difficult. I don't think my mother sees herself as being difficult.

"It's always important to everybody to conduct themselves professionally and respectfully and kindly so if I have ever disappointed somebody, it was never intentional."