Martha Stewart is fed up with her one-time protege – The Real Housewives of New York City star Bethenny Frankel.

Bethenny, who appeared on Martha’s Apprentice show in 2005, has been taking verbal swipes at the domestic diva on her reality series, painting Martha as a lonely and pitiful woman. And when the news got back to Martha, she was livid!

Referring to Martha growing her business empire at the expense of finding true and lasting romance, Bethenny quipped to fellow Housewife Jill Zarin: "Be careful what you wish for. You just might get it. I don’t want to end up like Martha Stewart. She’s alone with her business."

But currently single Bethenny, 38, who has been married once and has no children, is dumping on Martha as payback for not being chosen as the winner on The Apprentice: Martha Stewart four years ago, say sources. Bethenny was runner-up, losing to a contestant who was more pleasant than the sharp-tongued natural-food chef.

"Bethenny is using ‘Housewives’ as a platform to air her grievances about Martha – a dig here and a throwaway line there," an inside source told The ENQUIRER.

Martha feels that Bethenny is an "ungrateful fool," says another insider.

"She’s disgusted with Bethenny – especially since it was Martha’s show that helped launch Bethenny to where she is now."