Kate Del Castillo – the actress who brought Sean Penn and El Chapo together for a meeting that eventually led to the drug lord’s arrest – said the actor blindsided her by writing about the confab for Rolling Stone.

Del Castillo’s camp told TMZ that a lawyer for the infamous narco figure, Joaquin “El Chapo” Guzman, first reached out to her about doing a movie about his life, akin to “The Godfather.”

She agreed to it and planned to bring two filmmakers — a man named Espinoza and the other El Alto Garcia — for the meeting, her camp said. But one of them blabbed about to it Penn, according to Del Castillo.

When Penn asked to tag along, Del Castillo agreed to it, believing a big-name actor in the room could help push the project along, her people said.

She didn’t know that Penn went behind her back to Rolling Stone to pitch a story and get a green light from editor Jann Wenner, according to Del Castillo.

Wenner then wrote a letter, officially declaring Penn, Espinoza and Garcia — but not Del Castillo — as journalists on assignment, giving them legal protections as reporters in Mexico, TMZ reported.

When they met the fugitive drug lord on Oct. 2, Penn immediately declared he was interviewing El Chapo for Rolling Stone – and then hijacked the six-hour meeting, to Del Castillo’s shock, her camp said.

Mexican authorities have said they followed both Del Castillo and Penn before their meeting with El Chapo, and that their surveillance played a key role in Jan. 8 capture.

Del Castillo now fears her life is in danger, because El Chapo loyalists might blame her and Penn for leading cops to the drug kingpin.

Penn’s reps insisted to TMZ that he told Del Castillo about his Rolling Stone plans from the start and that she even helped in the article’s fact-checking, TMZ reported.