They have a captive audience.

“Jersey Shore” stars Nicole “Snooki” Polizzi and Jenni “JWoww” Farley are flooded with fan mail — from inmates in prison.

“I get a lot of jail letters,” Polizzi, 38, told The Post from the “ Jersey Shore: Family Vacation ” red carpet at Marquee nightclub in Chelsea last week.

Nicole “Snooki” Polizzi and Jenni “JWoww” Farley revealed that they receive fan letters from prison inmates. Getty Images for MTV

“I read them and I show my husband.”

Farley, 41, saves them all — just in case.

“I have a file just in case they get out, because it’s not like they went away for taking a car.…