“Pretty Little Liars” and “All My Children” star Natalie Hall goes nude in Plus One, a sci-fi thriller from Last House On the Left director Dennis Iliadis and screenwriter Bill Gullo. Hall plays Melanie, a naked party girl who meets her naked party girl clone while getting ready to bang some dude.

Plus One is set at the biggest party of the year and finds three college friends struggling to save their relationships and lives after a meteorite crashes nearby, screwing up the space-time continuum. Co-stars include Ashley Hinshaw (Chronicle), Rhys Wakefield (The Purge) and Logan Miller (Would You Rather).

Plus One marks Hall’s horror/sci-fi and nude debut. The Canadian stunner is best known for her role as heiress Colby Chandler on the ABC soap “All My Children” and as mean stepsister Kate Randall on the ABC Family hit series “Pretty Little Liars.”

Plus One arrives in selected theaters and VOD on Sept. 20.