Question: Which early "Playboy" Playmate was an American actress who helped popularize the bikini?
Context: Karen McDougal (born March 23, 1971) is an American model and actress.  She is known for her appearances in "Playboy" magazine as Playmate of the Month for December 1997 and Playmate of the Year of 1998.  In 2001, the readers of "Playboy" voted McDougal the runner-up of "The sexiest Playmate of the 1990s". Corinna Harney (born February 20, 1972) is an American model and actress.  She was chosen as "Playboy's" Playmate of the Month for August 1991 and "Playboy's" Playmate of the Year for 1992.  At age 20, she became the youngest Playmate of the Year ever at that point.  Harney is sometimes credited as Corina Harney, Corinna Harney-Jones, or Corinna Harney Jones. Elisa Rebeca Bridges (May 24, 1973 – February 7, 2002) was an American actress and model.  She is "Playboy" magazine's Playmate of the Month for December 1994, and "Playboy's" Video Playmate of the Month for September 1996.  She appeared in several video productions from "Playboy" Home Video from 1996 to 2000.  After appearing in "Playboy", she modeled frequently on assignments in Los Angeles, Miami, and Hawaii.  She also appeared as a model for "Perfect 10".  She was born in Miami and raised in Houston. Jayne Mansfield (born Vera Jayne Palmer; April 19, 1933 – June 29, 1967) was an American actress in film, theater, and television.  She was also a nightclub entertainer, a singer, and one of the early "Playboy" Playmates.  She was a major Hollywood sex symbol of the 1950s and early 1960s and one of 20th Century Fox's main sex symbol actresses.  She was also known for her well publicized personal life and publicity stunts, such as wardrobe malfunctions. Stacy Elizabeth Sanches, also known as Stacy Sanchez (born September 4, 1973), is an American model and actress.  She was "Playboy's" Playmate of the Month for March 1995 and "Playboy's" Playmate of the Year for 1996.  In June 1996, she was chosen Playmate of the Month for the German edition of "Playboy". Teri Marie Harrison Rose (born February 16, 1981 in Bradenton, Florida, United States) is an American model and actress.  A former student of the University of Central Florida, she was "Playboy"'s Playmate of the Month in October 2002.  She was photographed by Stephen Wayda.  Her involvement with "Playboy" began when her best friend encouraged her to send pictures of herself to the magazine.  Although she was chosen almost immediately as a Playmate, it was a year before she was assigned a month.  She was also the German "Playboy" Playmate of the Month, for January 2003.  According to Teri, her father is German and her mother is half-Japanese. The modern bikini made its debut in 1946, and since then it has caught the popular imagination becoming probably the most popular women's swimsuit, and not necessarily for swimming.  Today, bikinis appear in competitions, films, magazines, music, literature, magazines and even video games.  Despite the easy availability of more revealing glamour imagery, bikini modeling remains popular and can still create controversy.  Portrayals of the bikini in popular culture led, to a large extent, to its acceptance by Western society at large.  In 1960, Brian Hyland's pop song "Itsy Bitsy Teenie Weenie Yellow Polka Dot Bikini" inspired a bikini-buying spree.  The white bikini worn by Ursula Andress as Honey Ryder in the 1962 James Bond film "Dr. No" has been cited as one of the most famous bikinis of all time and an iconic moment in cinematic and fashion history.  By 1963, the movie "Beach Party", starring Annette Funicello and Frankie Avalon, led a wave of films that made the bikini a pop-culture symbol. " Playboy" first featured a bikini on its cover in 1962.  The Sports Illustrated Swimsuit Issue debuted two years later.  This increasing popularity was reinforced by its appearance in contemporary movies like "How to Stuff a Wild Bikini" featuring Annette Funicello and "One Million Years B.C." (1966) featuring Raquel Welch.  Raquel Welch's fur bikini in "One Million Years B.C." gave the world the most iconic bikini shot of all time in that period and the poster image became an important iconic moment in cinema history.  Hollywood stars such as Marilyn Monroe, Jayne Mansfield, Gina Lollobrigida and Jane Russell helped the growing popularity of bikinis further.  Pin up posters of Monroe and Mansfield, as well as Hayworth, Bardot and Raquel Welch distributed around the world contributed significantly to the popularity of the bikini. Kathleen Ann Shower (born March 8, 1953 as Kathleen Ann Schrauer) is an American model and actress.  Known as Kathy Shower she is "Playboy's" Playmate of the Month for May 1985 and Playmate of the Year for 1986.  At the time of her first appearance, she was the oldest woman ever to appear as a Playboy Playmate, at age 33 as well as a single mother of two. Allison Parks (October 18, 1941 – June 21, 2010), born Gloria Waldron, was an American model and actress.  She was chosen as "Playboy" magazine's Playmate of the Month in October 1965, and Playmate of the Year for 1966, with her as the cover model and a pictorial in the May issue.  She also appeared in the Playboy Mansion Pictorial in the January 1966 issue of Playboy (starting on page 105) along with Ashlyn Martin.  Her original pictorial was photographed by William Figge. Cassandra Lynn Hensley (née Jensen, previously D'Elia, August 15, 1979 – January 15, 2014) was an American model and is "Playboy's" Playmate of the Month for February 2006.  At age eighteen, Hensley moved to Newport Beach, California to study to become an aesthetician.  She also opened a tanning salon and did some modeling.  After placing in the Top 20 in a Hawaiian Tropic pageant, she submitted photos to "Playboy".  It was not until the second time she submitted photos that she received a callback and became a Playmate.  She made an appearance on the television series "Bikini Destinations" in 2008.
Answer: Jayne Mansfield