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“The Irishman” — starring Robert De Niro and Al Pacino — is way over budget and set to become director Martin Scorsese’s most expensive movie ever.

Netflix bought the film for $105 million and agreed to a $125 million budget. But costs have soared to $175 million, said one insider, “and they haven’t done the music yet.”

The shoot, with locations all over the tri-state area, started in August and wrapped earlier this month.

“Scorsese has shot [for more than] 106 days — the most he has ever spent shooting a movie,” said another source.

Scorsese’s “Hugo” was said to have taken 105 days to film.

The movie is based on the book “I Heard You Paint Houses” by Charles Brandt about Frank Sheeran, a union boss played by De Niro, and his alleged part in the 1975 disappearance of Jimmy Hoffa (Pacino).

But, since some scenes go back to 1959 and De Niro has to look like he’s 30, postproduction will require substantial CGI.

The cast includes Joe Pesci, Harvey Keitel, Ray Romano and Bobby Cannavale.

The movie isn’t scheduled to come out until 2019. Bo Dietl, who plays a Chicago capo who introduces Sheeran to Hoffa, joked, “I could be dead before the premiere.”

Scorsese’s publicist did not get back to me, and Netflix had no comment.