2. Katherine Heigl

Though always beautiful and sweet on screen, Katherine Heigl can be quite the b**ch to the people she works with.

Her extremely rude behavior and outrageous demands on set have apparently led to a quick decline in her career.

Katherine had something bad to say about almost all of her co-stars and all shows or movies she has done so far. Of her worst rants was about the writers of ”Grey’s Anatomy.” Namely, the actress stated that she will not accept an Emmy nomination because of “bad writing.”

Hmm… We’ll give her credit for this one.

“She can cost you time every single day of shooting,” one of her “Knocked Up” co-stars said. “Wardrobe issues, not getting out of the trailer, questioning the script every single day. Even getting her deal closed at Warners was hard. She hit that point of no.”