Liza Minnelli's 94-year-old stepmother is suing the newlywed performer for allegedly trying to toss her out of the Sunset Boulevard home she shared with Liza's dad, famed director Vincent Minnelli.

The elder-abuse and breach-of-contract lawsuit, filed in Los Angeles Superior Court, charged that Minnelli, 56, hasn't paid Lee Anderson Minnelli's housekeeper and other staffers, or her utilities. 

"So, while the defendant is honeymooning all over the world, having fed 850 of her closest friends a 12-foot cake, [the widow] is alone in a cold, dark house at age 94," the lawsuit charges. 

The lawsuit said the widow believes Liza has already sold the house "out from under her," and "attempted to cause her to sign away her . . . estate." 

The breach-of-contract charge stems from a 1988 agreement — a year after Vincent Minnelli's death — that gave the widow the Sunset Boulevard home. The elder-abuse charge arises from alleged nonpayment of bills. 

The lawsuit seeks unspecified damages. 

A spokesman for Minnelli, who was performing in London last night, did not immediately return a call for comment.

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