Bankrupt Teresa Giudice isn’t the only deadbeat on “Real Housewives of New Jersey.” Elvira Grau — the snarky party planner who debuted on the show Monday and boasted of a lux urious lifestyle replete with nan nies, maids, cooks and drivers — owes nearly $300,000 to the tax man. Grau and her husband, James, were slapped with massive state tax liens between January and March on various properties, including their $3 million Cresskill mansion, according to New Jersey Superior Court re cords. Grau said she was the newest housewife to join the show, a claim Bravo denied, although she’ll appear in more episodes. And despite her boasts to Guidice about having a shore house, property records show Grau and her husband don’t own any thing near a beach. Meanwhile, Giu dice’s beach house was seized by the banks after she and hubby Joe Giudice filed their $11 million bankruptcy in Octo ber. Bravo wouldn’t comment and Grau’s reps didn’t return calls.