Question: Beverly Hills Brats is a 1989 American comedy film, the film starred which Canadian-born American actress, dancer and singer most famous for her on-screen coupling with Dick Powell in a string of successful early musicals at Warner Brothers?
Context: The Dick Powell Show is an American anthology series that ran on NBC from 1961 to 1963, primarily sponsored by the Reynolds Metals Company.  It was hosted by longtime film star Dick Powell until his death from lung cancer on January 2, 1963, then by a series of guest hosts (under the revised title The Dick Powell Theater) until the series ended.  The first of these hosts was Gregory Peck, who began the January 8 program with a tribute to Powell, recognizing him as "a great and good friend to our industry."  Peck was followed by fellow actors such as Robert Mitchum, Frank Sinatra, Ronald Reagan, Glenn Ford, Charles Boyer, Jackie Cooper, Rock Hudson, Milton Berle, Jack Lemmon, Dean Martin, Robert Taylor, Steve McQueen, David Niven, Danny Thomas, Robert Wagner, and John Wayne. "You Must Have Been a Beautiful Baby" is a popular song with music by Harry Warren and lyrics by Johnny Mercer, published in 1938 by Remick Music Corporation.  It was featured in the Warner Brothers movie "Hard to Get," released November 1938, in which it was sung by Dick Powell. Ethel Ruby Keeler (August 25, 1909 – February 28, 1993) billed professionally as Ruby Keeler, was a Canadian-born American actress, dancer and singer most famous for her on-screen coupling with Dick Powell in a string of successful early musicals at Warner Brothers, particularly "42nd Street" (1933).  From 1928 to 1940, she was married to actor and singer Al Jolson.  She retired from show business in the 1940s, but made a widely publicized comeback on Broadway in 1971. Sunny is a 1930 all-talking Pre-Code musical comedy film, produced and released by First National Pictures, a subsidiary of Warner Brothers.  The movie was based on the Broadway stage hit, "Sunny", produced by Charles Dillingham, which played from September 22, 1925, to December 11, 1926.  Marilyn Miller, who had played the leading part in the Broadway production, was hired by Warner Brothers to reprise the role that made her the highest-paid star on Broadway.  The film starred Lawrence Gray, O. P. Heggie and Inez Courtney. God's Gift to Women (1931) is an American Pre-Code romantic musical comedy film by Warner Brothers.  The film starred Frank Fay, Charles Winninger, Laura LaPlante, Louise Brooks and Joan Blondell.  The film was based on the play called "The Devil Was Sick" by Jane Hinton, and was originally completed as a musical film.  Due to audience distaste for musicals, however, all the songs were cut in American prints.  The complete film was released intact in other countries, where there was no such decline in popularity. Beverly Hills Chihuahua 2 is a 2011 direct-to-DVD sequel to the family comedy film "Beverly Hills Chihuahua", the second film in the "Beverly Hills Chihuahua" series.  Directed by Alex Zamm, and starring George Lopez, Odette Yustman and Zachary Gordon, the film focuses on Papi and Chloe, now married and had five puppies.  The film was released by Walt Disney Studios Home Entertainment on February 1, 2011, in a two-disc Blu-ray and DVD combo pack. Down and Out in Beverly Hills is a 1986 American comedy film based on the French play "Boudu sauvé des eaux", which had previously been adapted on film in 1932 by Jean Renoir.  "Down and Out in Beverly Hills" was directed by Paul Mazursky, and starred Nick Nolte, Bette Midler and Richard Dreyfuss.  The film is about a rich but dysfunctional couple who save the life of a suicidal homeless man.  Musician Little Richard also makes an appearance, and contributed the song "Great Gosh a'Mighty" to the soundtrack. Beverly Hills Cop II is a 1987 American action comedy film directed by Tony Scott, written by Larry Ferguson and Warren Skaaren and starring Eddie Murphy.  It is the sequel to the 1984 film "Beverly Hills Cop" and the second installment in the "Beverly Hills Cop" series.  Murphy returns as Detroit police detective Axel Foley, who reunites with Beverly Hills detectives Billy Rosewood (Judge Reinhold) and John Taggart (John Ashton) to stop a robbery/gun-running gang after Captain Andrew Bogomil (Ronny Cox) is shot and seriously wounded. Beverly Hills Brats is a 1989 American comedy film.  Directed by Jim Sotos, the film starred Peter Billingsley, Martin Sheen, Burt Young, Terry Moore, George Kirby, Ruby Keeler (in her final film) and Whoopi Goldberg in a cameo role. A Midsummer Night's Dream is a 1935 American romance fantasy film of William Shakespeare's play, directed by Max Reinhardt and William Dieterle, and starring James Cagney, Mickey Rooney, Olivia de Havilland, Jean Muir, Joe E. Brown, Dick Powell, Ross Alexander Anita Louise, Victor Jory and Ian Hunter.  Produced by Henry Blanke and Hal Wallis for Warner Brothers, and adapted by Charles Kenyon and Mary C. McCall Jr. from Reinhardt's Hollywood Bowl production of the previous year, the film is about the events surrounding the marriage of the Duke of Athens, Theseus, and the Queen of the Amazons, Hippolyta.  These include the adventures of four young Athenian lovers and a group of six amateur actors, who are controlled and manipulated by the fairies who inhabit the forest in which most of the story is set.  The play, which is categorized as a comedy, is one of Shakespeare's most popular works for the stage and is widely performed across the world.  Felix Mendelssohn's music was extensively used, as re-orchestrated by Erich Wolfgang Korngold.  The ballet sequences featuring the fairies were choreographed by Bronislava Nijinska.
Answer: Ethel Ruby Keeler