The wealthy financier whose alleged secret love child grew up to be a television star promised she would get a “big surprise” in his will, according to newly filed court papers.

“I’m a gentleman and you may read into that only good,” John R. Jakobson allegedly told his mistress Marie Squerciati in 1981 of their daughter, Marina.

The women certainly got a shock when Jakobson, 86, died in April 2017 and failed to provide for Marina in his $100 million estate.

Marina Squerciati, 37, now stars in the NBC procedural “Chicago P.D.” and has sought to be included in Jakobson’s estate, along with his four other kids from marriage, including “Friends” actress Maggie Wheeler, who played Janice on the long-running sitcom.

Jakobson, who in 1955 became one of the youngest people to ever buy a seat on the New York Stock Exchange, paid for Marina’s nanny, private school tuition at Dalton and Northwestern University, while the girl and her mom stayed silent over his paternity.

There is no written evidence of Jakobson’s promise to Marie Squerciati, lawyers for Jakobson’s son and executor, Nicholas, wrote in a Manhattan Surrogate Court filing.

Nicholas Jakobson wants to bar Marie Squerciati from testifying about her communications with Jakobson under New York’s “dead man’s statute,” which is meant to protect a person’s estate from false claims by the living, by preventing those with a self-serving interest from testifying about their communications with the deceased.

Estate lawyers have refused to recognize Marina as Jakobson’s child.