Question: Which of the actors starred in "A Southern Yankee" is an American actress and former Metro-Goldwyn-Mayer contract star, who achieved notability during the 1950s?

Context articles: List of former Footlights members
Diana Lewis
Ann Richards (actress)
Laraine Day
Gloria DeHaven
TSV Straubing
A Southern Yankee
Johnny Duhan
Arlene Dahl
Betty Grable filmography

This is a list of former Footlights members.
 This is a listing of those former members who have achieved notability after graduating from Cambridge University.
 The careers of many prominent figures in the world of entertainment began in Footlights – while prominent figures in other industries also took part in Footlights.
 They include:
Diana Lewis (September 18, 1919 – January 18, 1997) was an American film actress and a Metro-Goldwyn-Mayer contract star.
Ann Richards (13 December 1917 – 25 August 2006) was an Australian actress and author, who achieved notability in a series of 1930s Australian films for Ken G. Hall as Shirley Ann Richards before moving to the United States, where she continued her career as a film actress, mainly as an MGM starlet.
 Her best known performances were in "It Isn't Done" (1937), "Dad and Dave Come to Town" (1938), "An American Romance" (1944), and "Sorry, Wrong Number" (1948).
 In the 1930s, she was the only Australian actor under a long-term contract to a film studio, Cinesound Productions.
 She subsequently became a lecturer and poet.
Laraine Day (October 13, 1920 – November 10, 2007) was an American actress and a former Metro-Goldwyn-Mayer contract star.
 As a leading lady in her day, she was paired opposite major film stars including Lana Turner, Cary Grant, and John Wayne.
Gloria Mildred DeHaven (July 23, 1925 – July 30, 2016) was an American actress and singer who was a contract star for Metro-Goldwyn-Mayer.
The TSV Straubing was a German association football club from the city of Straubing, Bavaria.
 The club achieved notability by playing in the second division from 1950 to 1961.
A Southern Yankee (1948) is an American comedy film, directed by Edward Sedgwick, starring Red Skelton and Arlene Dahl, and released by Metro-Goldwyn-Mayer.
 It is also known as The Spy.
Johnny Duhan (born 30 March 1950) started his career as a fifteen-year-old front man in the Limerick beat group Granny’s Intentions.
 After achieving some success in Dublin, they moved to London and were signed to the Decca/Deram record label, releasing several singles and one album, "Honest Injun."
 However, the band disbanded before Duhan was twenty one.
 Despite offers to front other bands, Duhan turned his back on the popular music industry and started writing folk songs, poetry and prose.
 He has condensed his various works over 40 years into a quartet of albums: "Just Another Town", "To The Light", "The Voyage" and "Flame".
 These correspond with the four chapters of his lyrical autobiography, "To The Light".
 His songs have achieved notability, largely thanks to the focus put on them by Christy Moore, The Dubliners, Mary Black and many other Irish and international singers.
 The Duhan song "The Voyage" has become a modern classic.
 Christy Moore stated that "The Voyage" (his most popular song according to iTunes) has been performed at over a million weddings worldwide.
Arlene Carol Dahl (born August 11, 1925) is an American actress and former Metro-Goldwyn-Mayer contract star, who achieved notability during the 1950s.
 She has three children, the eldest of whom is actor Lorenzo Lamas.
This is a complete filmography of Betty Grable, an American actress, dancer, and singer.
 As a major contract star for 20th Century-Fox during the 1940s and 1950s, she starred in a succession of musicals and romantic comedies.