Anna Nicole Smith doesn’t think Carmen Electra is fat enough to be pitching diet product! In a bizarre video on Anna Nicole’s website, the TrimSpa poster-girl, 39, rants against sexy Carmen, 34, for hawking the competitive NV weight-loss pill.

“I don’t understand it,� disoriented Anna Nicole rambles in a tirade shot before she gave birth to daughter Dannielynn on Sept. 7.

“I do these diet products. I do TrimpSpa…[but] she was never fat… I swear, it’s crazy. A skinny person versus a fat person who’s done it over and over?â€?

However, a source tells Star what’s really fueling the feud is that “Anna feels that Carmen dissed her when Carmen refused to take a role in Anna’s film Illegal Aliens. Carmen knew it would be a ‘D’ movie.�

Carmen’s rep tells Star: “Carmen was very flattered, but due to scheduling conflicts, was unable to do it.� As for the diet pills, she says, Carmen take it “for maintenance, not weight loss.� So there.

In addition, according to Star magazine, on her personal website, Anna says she’s better suited for diet ads than Carmen because she’s “very big� and people can “see me lose the weight again.� [source: Star magazine]