Former “Sex & the City” star Cynthia Nixon — a big supporter of Mayor de Blasio — is being urged to challenge Gov. Cuomo in a primary, a new report said Friday.

Liberal groups who don’t think Cuomo tilts far enough left are behind the effort, and Nixon’s pals say she is considering a bid, The Wall Street Journal reported.

Nixon, 51, has reinvented herself as a liberal activist, campaigning in 2013 for de Blasio, and attacking Cuomo’s policies on “The View” television show.

“She’s an out-of-the-box candidate with progressive credentials who would excite people,” Billy Easton, director of the Alliance for Quality Education, a public-education advocacy group, told the paper.

Analysts said that while Nixon would get a ton of publicity because of her celebrity, she would have little chance of upsetting the incumbent.