(CNN)Katherine Heigl once had a reputation in Hollywood for being "difficult." Now she's got an opinion about that opinion.In an interview with the Washington Post, the "Grey's Anatomy" actress said the rumors about her escalated to the point where she was labeled unprofessional, and now she feels that was unfair."I may have said a couple of things you didn't like, but then that escalated to 'She's ungrateful,' then that escalated to 'She's difficult,' and that escalated to 'She's