TCM’s star of the day is Ann Sothern, and my film pick for the actress is A Letter to Three Wives, which airs today at 8:00 P.M. (EST). The film recounts the lives of three women, Deborah Bishop (Jeanne Crain), Lora Mae Hollingsway (Linda Darnell), and Rita Phipps (Ann Sothern), after their friend Addie Ross…