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Katherine Heigl

Katherine Heigl makes a habit of throwing her projects under the bus once she's done them (see: Grey's Anatomy and Knocked Up for starters). But that's just the start of why many have called her unhireable. She's been accused of being unprofessional, flaky, and a constant complainer. Which explains why she went from in-demand rom-com star to making Nyquil commercials.