Question: When was the Austrian and American film actress that stared in My Favorite Spy born? 

Context articles: May Wallace
Kay Francis
My Favorite Spy
Hedy Lamarr
Louis Dolivet
Florence Hackett
Greta Garbo
Gail Patrick
Isabel Rea
Mabel Paige

May Wallace (August 23, 1877 – December 11, 1938) was an American film actress.
 She appeared in 63 films between 1914 and 1939.
 Wallace was born in Russiaville, Indiana and died in Los Angeles, California, where she worked in Hollywood as a film actress.
 She often played supporting roles for producer Hal Roach in his Laurel and Hardy and Our Gang comedies, mostly in maternal roles.
 Wallace was married to Thomas W. Maddox until her death, they had one daughter and one son.
 She died of heart disease, aged 61.
Kay Francis (January 13, 1905 – August 26, 1968) was an American stage and film actress.
 After a brief period on Broadway in the late 1920s, she moved to film and achieved her greatest success between 1930 and 1936, when she was the number one female star at the Warner Brothers studio and the highest-paid American film actress.
 Some of her film-related material and personal papers are available to scholars and researchers in the Wesleyan University Cinema Archives.
My Favorite Spy is a 1951 comedy film directed by Norman Z. McLeod and starring Bob Hope and Hedy Lamarr.
Hedy Lamarr ( ; born Hedwig Eva Maria Kiesler, November 9, 1914 January 19, 2000) was an Austrian and American film actress and inventor.
Louis Dolivet born as Ludovici Udeanu (March 26, 1908 – August 1989) was an émigré writer, editor of "Free World", film producer, and alleged Soviet spy born in Austria-Hungary, who later obtained French citizenship.
 From 1942–1949, he was married to Academy Award and Tony Award winning actress Beatrice Whitney Straight, of the prominent American Whitney family.
Florence Hackett (née Florence Hart) (January 1882 – August 21, 1954) was an American film actress in the silent era.
 She was allegedly married to veteran film star Arthur V. Johnson, reputedly D.W. Griffith's favorite actor.
 Previously she was married to a man named Maurice Hackett and had two sons, Albert Hackett and Raymond Hackett and a daughter Jeannine Hackett.
 Hackett was the proverbial stage mother involving her sons first in the theater then in motion pictures.
 From 1912 she and Johnson played in numerous films together with him directing many of them right up to his 1916 death.
 They were the type of films classified today as 'shorts', that is they ran one or two reels.
 Her boys also appeared in some of the films making the work more of a family affair.
 She made her last film appearance in 1920.
Greta Garbo (born Greta Lovisa Gustafsson; ] ; 18 September 1905 – 15 April 1990), was a Swedish-born American film actress during the 1920s and 1930s.
 Garbo was nominated three times for the Academy Award for Best Actress and received an Academy Honorary Award in 1954 for her "luminous and unforgettable screen performances."
 In 1999, the American Film Institute ranked Garbo fifth on their list of the greatest female stars of classic Hollywood cinema, after Katharine Hepburn, Bette Davis, Audrey Hepburn, and Ingrid Bergman.
Gail Patrick (June 20, 1911 – July 6, 1980) was an American film actress and television producer.
 Often cast as the bad girl or the other woman, she appeared in more than 60 feature films between 1932 and 1948, notably "My Man Godfrey" (1936), "Stage Door" (1937) and "My Favorite Wife" (1940).
 After retiring from acting she became, as Gail Patrick Jackson, president of Paisano Productions and executive producer of the "Perry Mason" television series (1957–66).
 She was one of the first women producers, and the only female executive producer in prime time during the nine years "Perry Mason" was on the air.
 She served two terms (1960–62) as vice president of the National Academy of Television Arts and Sciences and as president of its Hollywood chapter—the first woman to serve in a leadership capacity in the academy, and its only female leader until 1983.
Isabel Rea (1889-?)
 born in Coxsackie, New York also sometimes credited as Isabel Rae, was an American film actress of the silent era, specifically the decade of the 1910s.
 In Daniel Blum's "A Pictorial History of the Silent Screen" she is credited in a photograph as Isabel Rea, member of the original Independent Moving Pictures (IMP) Film Company in 1911, alongside actors such as Mary Pickford.
 Further in the book she is credited as Isabel Rae in a photograph for Universal Studios.
 Apart from her work in silent films, very little is known of her and her whereabouts after approximately 1918, and no date is death is recorded on IMDB.
 While there are several entries for Isabel/Isabella Rea on the Find a Grave website none of these can be definitely identified as those for silent film actress Isabel Rea.
Mabel Paige (December 19, 1880 – February 9, 1954) was an American stage and film actress.
 She was born in New York, New York and began acting at age 4.
 She went on to appear in dozens of popular stage plays, including "Little Lord Fauntleroy" in 1892, "Rip van Winkle" in 1899, and "At Cozy Corners" in 1905.
 In the South, she became particular a favorite and was acclaimed as the "Idol of the South."
 Her Mabel Paige Theatrical Company toured the region for many years.
 She later acted in more than 50 films between 1914 and 1953.
 In her first silent films for the Lubin Company, she co-starred in romantic comedies with Oliver Hardy as her leading man.
 One of Paige's last appearances as an actress was on the CBS-TV sitcom "I Love Lucy".
 That episode, "The Girls Go Into Business", aired on October 12, 1953, four months before Paige's death at the age of 73.
 She died in Van Nuys, California from a heart attack on February 9, 1954.