You can call Kelly Osbourne a lot of things, but don't compare her to Giuliana Rancic.

The former Fashion Police co-host recently went on a rant about how much she despises Giuliana. And while the former E! News host hasn't said anything in retaliation, we doubt Kelly cares.

The 30-year-old isn't the only to celebrity who openly despises another star. Click through the gallery to see seven more celebs who have some serious hatred toward other people in the limelight.