"Ann-Margret will play the ever-beautiful June Wilson, a major star back in her day who has a past with Ray's boss Ezra Goldman," the cable television network said in a news release Monday.
Production on the second season's 12 episodes is currently under way in Los Angeles. The show is set for a summer premiere on Showtime.
Ann-Margret is best known for her roles in the movie musicals "Viva Las Vegas," "Pocketful of Miracles" and "Bye Bye Birdie."
2014: The Year in Music [PHOTOS]