Don Johnson continues his comedy streak with a turn as a mustachioed porn director in “Born to Be a Star,” the Adam Sandler and Jack Giarraputo-produced pic being released by Sony.

Nick Swardson is starring as a small-town nerd who learns his quiet and demure parents were famous porn stars in the 1970s. This motivates him to leave northern Iowa for Hollywood, hoping to follow in their footsteps and fulfill his destiny as the biggest adult-film star in the world.

Johnson plays a down-on-his-luck director who discovers Swardson and gives him a shot.

The cast also includes Christina Ricci as Swardson’s innocent girlfriend and Stephen Dorff as adult film star Dick Shadow, as well as Edward Herrmann and Tyler Spindel.

Allen Covert and Barry Bernardi also are producing the film, which Tom Brady is directing. Sandler co-wrote the script with Swardson.

WMA and Untitled Entertainment-repped Johnson, long known for his dramatic and tougher roles, kicks off his comedy run with this summer’s “When in Rome,” a romantic comedy from Disney starring Kristen Bell. He also will appear in Endgame Entertainment’s “A Good Old Fashioned Orgy.”