Nancy Reagan was a well-known actress
It's easy to recognize Mrs. Reagan's pretty face in a number of Hollywood films back in the day. Before becoming a First Lady, she starred in 11 feature films, including The Next Voice You Hear, Donovan's Brain, and the Academy Award-nominated documentary The Dark Wave. However, her name may not be so easily found in the credits; as an actress, she went by the stage name "Nancy Davis."
45 Facts You Never Knew About America's First Ladies, Source:https://www.rd.com/list/first-ladies-trivia/