Question: What was the nationality of Lana Turner's co-star in "The Three Musketeers"?

Context paragraphs:
The Three Musketeers (1969 film): The Three Musketeers is a 1969 made-for-television film.  It has never appeared on VHS or DVD.  The film is based on the novel "The Three Musketeers" ("Les Trois Mousquetaires") by Alexandre Dumas, père.  This version stars Kenneth Welsh as d'Artagnan.  The Three Musketeers, Athos, Porthos and Aramis, are played by Powys Thomas, James Blendick and Colin Fox.  Academy Award-winner actor Christopher Walken makes a very early film appearance as Felton.

The Big Cube: The Big Cube is a 1969 American thriller film directed by Tito Davison and starring Lana Turner, Karin Mossberg, George Chakiris, Daniel O'Herlihy and Richard Egan; it was one of Lana Turner's last movies.  It is notable for its aggressive portrayal of LSD use and the 1960s youth counterculture as vicious evils.

The Four Musketeers (1974 film): The Four Musketeers (also known as The Four Musketeers: Milady's Revenge) is a 1974 Richard Lester film that serves as a sequel to his "The Three Musketeers", and covers the second half of Dumas' 1844 novel "The Three Musketeers".

Slightly Dangerous: Slightly Dangerous is a 1943 American romantic comedy film starring Lana Turner and Robert Young.  A bored young woman in a dead-end job runs away to New York City and ends up impersonating the long-lost daughter of a millionaire.  The film was directed by Wesley Ruggles and written by Charles Lederer and George Oppenheimer from a story by Aileen Hamilton.  According to Turner Classic Movies film historian Robert Osborne, one sequence early in the film – in which Lana Turner's character does her job at the soda fountain while blindfolded – was actually directed by an uncredited Buster Keaton.

Mickey, Donald, Goofy: The Three Musketeers: Mickey, Donald, Goofy: The Three Musketeers is an American direct-to-video animated family musical action comedy film adaptation of the novel "The Three Musketeers" by Alexandre Dumas, père.  As the title suggests, it features Mickey Mouse, Donald Duck, and Goofy as the three musketeers.  This film was directed by Donovan Cook, produced by Walt Disney Pictures and DisneyToon Studios, and released directly to VHS and DVD on August 17, 2004, by Walt Disney Studios Home Entertainment, and was later re-released on Blu-ray Disc on August 12, 2014, coinciding with the film's 10th anniversary.

Gene Kelly: Eugene Curran Kelly (August 23, 1912 – February 2, 1996) was an American dancer, actor of film, stage and television, singer, film director, producer, and choreographer.  He was known for his energetic and athletic dancing style, his good looks, and the likeable characters that he played on screen.

3 Musketeers (film): 3 Musketeers is a direct-to-video action film by The Asylum loosely based on "The Three Musketeers" by Alexandre Dumas.  The film is directed by Cole McKay and is a mockbuster that was released shortly after the Paul W. S. Anderson film "The Three Musketeers".  The film was released on DVD and Blu-ray disc on October 25, 2011.

The Three Musketeers (1973 film): The Three Musketeers (also known as The Three Musketeers: The Queen's Diamonds) is a 1973 film based on "The Three Musketeers" by Alexandre Dumas, père.  It was directed by Richard Lester and written by George MacDonald Fraser.  It was originally proposed in the 1960s as a vehicle for The Beatles, whom Lester had directed in two other films.

The Three Musketeers (1948 film): The Three Musketeers (1948) is a Technicolor adventure film adaptation of the classic novel "The Three Musketeers" by Alexandre Dumas, père, written by Robert Ardrey, which starred Gene Kelly and Lana Turner.  The film is today best remembered by many movie fans for its outstanding fight choreography in the combat sequences, which has been used as inspiration for movie fight scenes ever since.

Mr. Imperium: Mr. Imperium (UK title: You Belong to My Heart) is a 1951 romantic musical drama Technicolor film made by Metro-Goldwyn-Mayer, starring Lana Turner and singer Ezio Pinza.  It was directed by Don Hartman who co-wrote the screenplay with Edwin H. Knopf, based on a play by Edwin H. Knopf.  The music score is by Bronisław Kaper.  Lana Turner's singing voice was dubbed by Trudy Erwin.

Supporting paragraphs: The Three Musketeers (1948 film) Gene Kelly
Answer: American