Katherine Heigl feels ''sorry'' she made a ''crappy impression'' on Shona Rhimes.

The 35-year-old actress - who was branded difficult and accused of being a diva on other sets earlier this year - has spoken out after the 'Grey's Anatomy' creator appeared to brand her an ''a*****e'' and implied she was hard to work with in a recent interview.

She said: ''The last one with Shonda ... it sucks.

''I am sorry that she feels that way and I wish her nothing but greatness, and I have nothing negative to say about Shonda. I'm a big fan of her work. I watch 'Scandal' every week, and so I'm sorry she's left with such a crappy impression of me. I wish I could do something to change that. Maybe I will be able to someday.''

The 'State of Affairs' actress - who has daughters Naleigh, five, and Adelaide, two, with husband Josh Kelley - admitted hearing stories of her bad reputation have been difficult to ''stomach'' but she is doing her best to prove them wrong.

She added in an interview with 'Extra': ''Yeah, that took some stomaching and having to just go, OK, there's nothing I can do about this except to sort of prove it wrong, you know, and the only way to prove it wrong is for people to have a work experience with me that doesn't speak to that at all.''

Katherine spoke out after Shonda said she has no time for ''nasty people'' anymore.

Discussing the tight-knit cast on her other show 'Scandal' and her ''no a******s'' policy, she added: ''There are no Heigls in this situation...

''I don't put up with bulls**t or nasty people. I don't have time for it.''

The duo's friendship soured in 2008 after the blonde beauty, who played Dr. Izzie Stevens on the show for five years until 2010, withdrew her name from awards consideration because she felt she hadn't been provided the material ''to warrant an Emmy nomination.''