Joe Otterson TV ReporterJudy Greer has signed on for a guest starring role in the upcoming Showtime series “The First Lady.”Formerly known as “First Ladies,” the show is described as a reframing of American leadership, told through the lens of the women at the heart of the White House. Viola Davis will star as Michelle Obama, while Michelle Pfeiffer will play Betty Ford.Greer is set to play Nancy Howe, Ford’s trusted confidante and social secretary.