Question: The Youngest Profession is a 1943 film, directed by Edward Buzzell, it contains cameos by which American actor, and a major star at Metro-Goldwyn-Mayer?
Context: The Human Side is a 1934 American drama film directed by Edward Buzzell and written by Edward Buzzell, Frank Craven and Ernest Pascal.  The film stars Adolphe Menjou, Doris Kenyon, Charlotte Henry, Reginald Owen, Joseph Cawthorn and Betty Lawford.  The film was released on September 1, 1934, by Universal Pictures. William Horatio Powell (July 29, 1892 – March 5, 1984) was an American actor.  A major star at Metro-Goldwyn-Mayer, he was paired with Myrna Loy in 14 films, including the "Thin Man" series based on the Nick and Nora Charles characters created by Dashiell Hammett.  Powell was nominated for the Academy Award for Best Actor three times: for "The Thin Man" (1934), "My Man Godfrey" (1936), and "Life with Father" (1947). Child of Manhattan is a 1933 American pre-Code melodrama film based on the play "Child of Manhattan" by Preston Sturges, which was presented on Broadway in 1932.  The film was directed by Edward Buzzell and written for the screen by Gertrude Purcell, and stars Nancy Carroll, star of musical comedies at Paramount, John Boles, and cowboy star Charles "Buck" Jones. Best Foot Forward is a 1943 American musical film adapted from the 1941 Broadway musical comedy of the same title.  The film was released by Metro-Goldwyn-Mayer, directed by Edward Buzzell, and starred Lucille Ball, William Gaxton, Virginia Weidler, Chill Wills, June Allyson, Gloria DeHaven, and Nancy Walker. The Youngest Profession is a 1943 film, directed by Edward Buzzell, and starring Virginia Weidler, Edward Arnold, John Carroll, Scotty Beckett, and Agnes Moorehead.  It contains cameos by Greer Garson, Lana Turner, William Powell, Walter Pidgeon, and Robert Taylor. The Luckiest Girl in the World is a 1936 American comedy film directed Edward Buzzell and written by Herbert Fields and Henry Myers.  The film stars Jane Wyatt, Louis Hayward, Nat Pendleton, Eugene Pallette, Catherine Doucet and Phillip Reed.  The film was released on October 1, 1936, by Universal Pictures. Neptune's Daughter is a 1949 Technicolor musical romantic comedy film released by Metro-Goldwyn-Mayer starring Esther Williams, Red Skelton, Ricardo Montalbán, Betty Garrett, Keenan Wynn, Xavier Cugat and Mel Blanc.  It was directed by Edward Buzzell, and features the Academy Award winning song "Baby, It's Cold Outside" by Frank Loesser. Aap Ki Marzi (As You Please) is 1939 Hindi romantic comedy film directed by Sarvottam Badami.  The film was produced under the Sudama Productions banner.  The music composer was Gyan Dutt with lyrics credited to Pyare Lal Santoshi and S. P. Kalla.  It starred Motilal, Sabita Devi, Khursheed, K. N. Singh, Mazhar Khan, Vasanti and Sunalini Devi.  This was director Badami's second comedy film; he had earlier directed the comedy "Teen Sau Din Ke Baad" (1938) which turned out be a box office success.  "Aap Ki Marzi" was based on the MGM produced, Edward Buzzell directed film "Paradise for Three" (1938) from Erich Kastner's novel. Honolulu is an American musical film that was released by Metro-Goldwyn-Mayer in 1939.  The film stars dancer Eleanor Powell and Robert Young, and was directed by Edward Buzzell.  Also appearing in the film are George Burns, Gracie Allen, Eddie "Rochester" Anderson, and Rita Johnson. Transient Lady is a 1935 American drama film directed by Edward Buzzell and written by Edward Buzzell, Arthur Caesar and Harvey F. Thew.  The film stars Gene Raymond, Henry Hull, Frances Drake, June Clayworth, Clark Williams and Edward Ellis.  The film was released on March 4, 1935, by Universal Pictures.
Answer: William Powell