Dead billionaire Bruce Wasserstein’s mistress has four more daughters on ice as frozen embryos — despite his death in 2009.

Erin McCarthy had one daughter with the powerful ex-Lazard chairman before he died, Sky, now 15, then a second daughter, Rose, five years ago — and now four more female embryos remain on ice, court papers have revealed.

The revelation comes as Sky and her mother McCarthy sue for more than $100M of his fortune depicting the teen as “Cinderella” and her incredibly wealthy half-siblings “evil stepsisters.”

Sky and McCarthy’s lawyers say they are exploring how to gain legal rights for Rose and the four frozen daughters, raising the possibility of more bitter litigation.

Late Lazard chairman and New York Magazine owner Wasserstein, who died aged 61, left behind six kids. Then Rose was born in 2018, nine years after his death, making a total of seven children.

He also left a widow, two ex-wives and a mistress and four lavish residences: a London townhouse, a Paris apartment, a 17-acre Santa Barbara estate, and a sprawling, 27.5-acre oceanfront East Hampton property known as Cranberry Dune, valued at over $120 million.

Should McCarthy — who claims Wasserstein agreed to raise all his cryopreserved children with her — decide to give birth to the remaining four children, that would take their joint brood to six kids, so the potential ice family would outnumber his existing children with other women.

The brood includes adults Pamela, Ben and Scoop with ex-wife Christine Parrott and teenagers Jack and Dash with second wife Claude Becker.

After Bruce’s death, Claude took in Lucy, his late sister Wendy’s daughter.

Sky’s attorney, power family and divorce lawyer Bill Zabel said, “We are exploring whether the four embryos have legal rights — we know they are all girls — should they be transferred and become individuals.”

McCarthy, 45, underwent fertility and IVF treatment at Weill Cornell’s Center for Reproductive Medicine. She signed paperwork agreeing that unused cryopreserved embryos would be discarded in 2027, when she turns 55.

Wasserstein also signed the paperwork agreeing that the embryos “have rights of survivorship” and they would be fully owned by McCarthy in the event of his death.

This week, we exclusively revealed that lawyers for McCarthy and Sky are suing Wasserstein’s other children for more than $100 million, dramatically portraying herself in court as “Cinderella” while claiming her half-siblings are the “evil stepsisters.”

Papers filed in New York Surrogate’s Court on Tuesday specifically allege that Sky’s half-sister Pamela Wasserstein — the 45-year-old president of Vox Media, which owns New York Magazine — is a “bully” who has allegedly connived to stop her from getting her full inheritance.

“This campaign against Sky has been pursued with particular zeal by Pam [Wasserstein], who serves as Sky’s trustee despite a plethora of conflicts and self-dealing,” Sky’s lawyers said.

“Pam, by her bullying, ostracizing and neglecting Sky … makes even the behavior of Cinderella’s evil stepsisters Drizella and Anastasia seem mild. But there is no Prince Charming in the Wasserstein family coming to save Sky.”

Lawyers for Sky are asking for a settlement to be determined at trial for more than $100 million as well as further damages for her “ostracism,” plus the appointment of an independent trustee of her estate.

Sky is already sitting on an estimated $170 million inheritance. She lives with her mom and sister Rose in a Central Park West pad.

The Post previously reported the other Wasserstein kids blame McCarthy for splitting up their family and accuse her of breaking into Cranberry Dune in the middle of the night when Sky was an infant, screaming, “Your dad’s a bastard” at his youngest sons. 

McCarthy denies breaking in.

A spokesperson for the executors of the estate and the trustees of Mr. Wasserstein’s family trust said: “Erin McCarthy gave birth to Rose roughly seven years after Bruce Wasserstein passed away. Under the terms of Mr. Wasserstein’s trust and estate documents, any such child would not be a beneficiary.”