Question: Song of Love starred the actress who received how many Best Actress Academy Awards?
Context: Katharine Houghton Hepburn (May 12, 1907 – June 29, 2003) was an American actress.  Known for her fierce independence and spirited personality, Hepburn was a leading lady in Hollywood for more than 60 years.  She appeared in a range of genres, from screwball comedy to literary drama, and she received four Academy Awards—a record for any performer—for Best Actress.  In 1999, Hepburn was named by the American Film Institute as the greatest female star of Classic Hollywood Cinema. Jill Clayburgh (April 30, 1944 – November 5, 2010) was an American actress.  She won Best Actress at the Cannes Film Festival and was nominated for the Academy Award for Best Actress for her role in the 1978 film "An Unmarried Woman."  She received a second Best Actress Academy Award nomination for the 1979 film "Starting Over." Jackie Aygemang Appiah (born 5 December 1983) is a Canadian-born Ghanaian actress.  For her work as an actress, she has received several awards and nominations, including the awards for "Best Actress in a Leading Role" at the 2010 Africa Movie Academy Awards; and "Best Actress in a Supporting Role" at the Africa Movie Academy Awards in 2007.  She received two nominations for "Best Actress in a Leading Role" and "Best Upcoming Actress" at the Africa Movie Academy Awards in 2008. Rekha is an Indian film actress who primarily works in Hindi films. Hailed as one of India's finest actresses, she made her debut as a child artist in 1966 and went on to appear in lead roles in the early 1970s.  Since her debut as a leading actress she has acted in over 180 films.  Rekha has often portrayed strong female characters, while also acting in some arthouse films besides numerous mainstream cinema.  She has won four Filmfare Awards; two Best Actress Awards—resulting from seven nominations, one Best Supporting Actress Award—resulting from six nominations, and a Lifetime Achievement Award.  The first award came in 1981 for the Hrishikesh Mukherjee-directed "Khubsoorat" where she was cast in a comic role.  Her portrayal of a classical courtesan in "Umrao Jaan" (1981) fetched her the National Film Award for Best Actress in 1982.  Rekha received her second Filmfare award in 1989 for "Khoon Bhari Maang".  She portrayed the role of a widow who sets out to take revenge on her lover.  Her negative role in "Khiladiyon Ka Khiladi" was highly appreciated by the critics and earned her a Filmfare Award in the Best Supporting Actress category.  In 2003, she was presented with the Lifetime Achievement Award.  In 2010, Rekha was awarded the Padma Shri, the 4th highest civilian honour in India.  Other awards won by her include International Indian Film Academy Awards, Bengal Film Journalists' Association Awards, Star Screen Awards, Zee Cine Awards, Stardust Awards and Bollywood Movie Awards. Halle Maria Berry (born Maria Halle Berry; August 14, 1966) is an American actress.  Berry won the 2002 Academy Award for Best Actress for her performance in the romantic drama "Monster's Ball" (2001).  s of 2017 , she is the only black woman to have won a Best Actress Academy Award. Song of Love (1947) is a biopic starring Katharine Hepburn, Paul Henreid, Robert Walker, and Leo G. Carroll, directed by Clarence Brown and released by Metro-Goldwyn-Mayer. Dame Kristin Ann Scott Thomas, DBE (born 24 May 1960), is an English actress.  She won the Best Supporting Actress BAFTA Award for "Four Weddings and a Funeral" (1994) and received a Best Actress Academy Award nomination for "The English Patient" (1996).  For her work in the theatre, she has been nominated for the Olivier Award for Best Actress five times, winning in 2008 for the Royal Court revival of "The Seagull". Catherine Elise Blanchett, {'1': ", '2': ", '3': ", '4': "} ( ; born 14 May 1969) is an Australian actress and theatre director.  She has received international acclaim and many accolades, including two Academy Awards, three Golden Globe Awards, three BAFTA Awards, six AACTA Awards, and three Screen Actors Guild Awards. Blanchett came to international attention for her role as Elizabeth I of England in Shekhar Kapur's 1998 film "Elizabeth", for which she won the BAFTA Award for Best Actress, the Golden Globe Award, and earned her first Academy Award for Best Actress nomination.  Her portrayal of Katharine Hepburn in Martin Scorsese's 2004 film "The Aviator" brought her critical acclaim and many accolades, including the Academy Award for Best Actress in a Supporting Role, making her the only actor to win an Oscar for portraying another Oscar-winning actor.  In 2013, she starred as Jasmine Francis in Woody Allen's "Blue Jasmine", for which she won numerous accolades including the Academy Award for Best Actress. Shinobu Otake (大竹 しのぶ , Ōtake Shinobu , born 17 July 1957) is a Japanese actress.  She has won three Japanese Academy Awards: the 2000 Best Actress award for "Poppoya", and the 1979 awards for both Best Actress ("The Incident") and Best Supporting Actress ("Seishoku no ishibumi").  She also won the award for best actress at the 12th Hochi Film Award for "Eien no 1/2".  At the 25th Moscow International Film Festival she won the award for Best Actress for her role in "Owl".  She has received a total of 12 nominations. This is a list of winners of the Academy Award for Performance by an Actress in a Leading Role, presented annually by the Academy of Motion Picture Arts and Sciences (AMPAS) to an actress who has delivered an outstanding performance while working within the film industry.  More popularly known as the Academy Award (or the Oscar) for Best Actress, this award was initially presented at the 1st Academy Awards ceremony for 1927–1928 and was most recently presented at the 88th Academy Awards ceremony for 2015.  Throughout the past 89 years, accounting for ties and repeat winners, AMPAS has presented a total of 90 Best Actress awards to 75 different actresses.  This list is current as of the 89th Academy Awards ceremony held on February 26, 2017.
Answer: four