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Who knew that appearing on Celebrity Apprentice would prove to be so challenging for Brandi Glanville? Indeed, a new rumor has surfaced that the Real Housewives of Beverly Hills star has been feuding with Vivica A. Fox while filming Donald Trump's NBC competition show. 

Brandi and Vivica were reportedly pals in the past, but Radar Online reports that they have been having serious issues while filming the upcoming season of Celebrity Apprentice, which they are both contestants on. 

"Brandi and Vivica have known each other socially in Los Angeles for years, and always got along," says a source. "Fast forward to both ladies filming for Celebrity Apprentice, and the gloves are off. There have been allegations of cheating and lying between the two, and they have had epic screaming matches."

Yikes! That said, the source feels that both Brandi and Curb Your Enthusiasm actress Vivica will prove to be formidable competitors on the show, regardless of their differences. "Expect both ladies to go very far in the show and do very well," adds the insider. 

It's unfortunate to hear that Brandi and Vivica are going at it, as this news comes on the heels of reports that Brandi has struggled in other ways on the show. She reportedly has been battling substance abuse issues due to the stress of the show  although she denies this claim  and has also been reportedly fighting with Kate Gosselin. 

We can't wait for Celebrity Apprentice to start airing, so we can see the drama unfold for ourselves!

Are you surprised that Vivica and Brandi appear to be having issues? And which one do you think will last longer on the show? 

Source: Radar Online