Not "Hot"

Paris Hilton says she and Nicole Richie are on the outs.

She's released a statement saying, "It's no big secret" the two are no longer friends. But the hotel heiress refuses to reveal the cause of the spat. She'll only say, "Nicole knows what she did."

Last week, the 24-year-old told USA Today that another friend will replace Richie on the next installment of the reality show.

Fox has denied planning a casting change for season four. A network statement says producers are reviewing the show's "creative direction."