Emmy award-winning actress Katherine Heigl was relatively unknown before she began drawing notice for her work in Grey’s Anatomy, a medically-themed drama that details the love and working lives of those who work at Seattle Grace Hospital. Now she’s becoming a bit of a household name thanks to her triumphs at award shows and the box office, but Heigl isn’t afraid to speak out against the show that made her a star.

The actress famously pulled herself out of the Emmy race in June 2008, saying she withdrew her name because she “did not feel [she] was given the material this season to warrant an Emmy nomination.” That’s a direct dig at the writing staff of Grey’s. Now, Heigl is lashing out at the crew.

During an appearance on David Letterman’s late show, Heigl said her first day back on the Grey’s set was “cruel and mean.” She told the host that she had to work “a seventeen-hour day,” and that “I’m going to keep saying this because I hope it embarrasses them.”

Heigl reportedly makes $13 million per season on Grey’s. For that kind of dough, there are about forty-seven thousand actresses who would work seventeen hour days with nary a word of complaint.