Jessica Simpson vs. Vanessa Minnillo

Jessica Simpson and Vanessa Minnillo are feuding over a man - but this time it's not nick lachey! it's mane man Ken Paves, whom Vanessa is courting!

"Jessica is furious with vanessa for going after her longtime stylist, Ken," says a source.

"Vanessa had her assistant contact ken in march to find out his availability. so Vanessa called Ken in early april. he told her he'd be happy to take her on."

Well, that didn't sit well with Jessica! "she found out," says the source, "and lashed out at Ken and called him a traitor and tried to force him to choose between her and Vanessa!"

Hmm, no there's a cat fight I'd happily pay to see.