So much for Best Friends Forever! Paris Hilton is reportedly fuming that her former besties, The Kardashian Sisters, are eclipsing her in money and fame stakes.

Celebrity snoops tell The New York Post’s “PageSix Column” that the hotel heiress can’t digest the fact that Kim and her curvy sibs, Kourtney and Khloe — who got their first big break by hanging out on the Hollywood scene with Hilton — are becoming more famous and earning more cash than she does on the nightclub circuit.

The socialite is now declaring war on the sisters and boosting her brand by pushing a new beauty line to make herself more “likeable.”

Well, good luck with that , P.

“Paris is furious that Kim got her start by hanging out in Hollywood with her-and now, the Kardashians have it all, the reality shows, the magazine covers, the big appearance fees and promotional deals,” a spy blabbed in Sunday’ Post.

“She used to command $100,000 dollars for club appearances, but now Kim is the hottest girl-and they aren’t friends anymore. The magazines are bidding around $300,000 dollars for Kourtney’s baby-shower and baby pictures. And Khloe’s wedding brought in record ratings for E!” the tattle added.

“Paris has realized that standing for excess in a recession doesn’t appeal. The Kardashian girls seem more real, and girls identify with them more. She’s got to ditch the pink Bentley and concentrate on developing herself.”