Cate Blanchett will star as Lucille Ball in a biopic that’s being produced by her two children — Lucie Arnaz and Desi Arnaz Jr. Aaron Sorkin is in talks to write the script, which will center on Ball’s 20-year marriage to Desi Arnaz. She eloped with the Cuban bandleader in 1940, and the two created the massively successful sitcom in 1951.  No news on who is to play husband Desi, however.  Desi Arnaz died in 1986 and Lucille Ball died in 1989.