'Fifty Shades Of Grey' has finally found its Ana and Christian.

American actress and model Dakota Johnson will play the lead female role in the film adaptation of EL James' erotic novel and Charlie Hunnam will play her S&M lover, Christian Grey.

dakota

Charlie Hunnam and Dakota Johnson

'Fifty Shades' author confirmed the news on Monday, posting on Twitter she wrote:

Johnson, who has previously had supporting roles in 'The Five Year Engagement' and 'The Social Network', is the daughter of actors Don Johnson and Melanie Griffith.

The 23-year-old's casting as naive university student Anastasia Steele comes after months of speculation, with names such as Emma Watson and Amanda Seyfried previously being thrown into the ring.

British actor Hunnam, 33, is best known for his role as Nathan Maloney in the Channel 4 drama 'Queer as Folk' and recently starred in 'Pacific Rim' alongside Idris Elba.

He is a relatively unknown actor, compared to the names who were previously rumoured for the role including Ian Somerhalder and Chris Hemsworth.

The producers of 'The Social Network', Michael De Luca and Dana Brunetti, are also producing 'Fifty Shades of Grey'. British filmmaker Sam Taylor-Wood will direct the flick, set for release in August 2014.

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  • Dakota Johnson

    PARIS, FRANCE - JULY 03: Dakota Johnson attends the Viktor&Rolf show as part of Paris Fashion Week Haute-Couture Fall/Winter 2013-2014 at La Gaite Lyrique on July 3, 2013 in Paris, France. (Photo by Pascal Le Segretain/Getty Images)

  • Dakota Johnson

    NEW YORK, NY - AUGUST 22: Imogen Poots (L) and Dakota Johnson attend Soho House New York's 10th birthday celebration with a live performance by Mumford and Sons on the roof top at Soho House on August 22, 2013 in New York City. (Photo by Andrew H. Walker/Getty Images for Soho House)

  • Dakota Johnson

    LOS ANGELES, CA - JUNE 08: Actress Dakota Johnson speaks onstage during the 12th Annual Chrysalis Butterfly Ball on June 8, 2013 in Los Angeles, California. (Photo by Michael Buckner/Getty Images for Chrysalis)

  • Dakota Johnson

    LOS ANGELES, CA - JUNE 08: Actress Dakota Johnson arrives at the 12th Annual Chrysalis Butterfly Ball on June 8, 2013 in Los Angeles, California. (Photo by Jonathan Leibson/Getty Images for Chrysalis)

  • Dakota Johnson

    LOS ANGELES, CA - JUNE 08: Actress Dakota Johnson attends the 12th Annual Chrysalis Butterfly Ball on June 8, 2013 in Los Angeles, California. (Photo by Michael Buckner/Getty Images for Chrysalis)

  • Dakota Johnson

    LOS ANGELES, CA - JUNE 02: Actress Dakota Johnson attends the 26th Annual BAFTA LA Garden Party at the British Consuls General Residence on June 2, 2013 in Los Angeles, California. (Photo by Frazer Harrison/Getty Images)

  • Dakota Johnson

    LOS ANGELES, CA - FEBRUARY 13: Dakota Johnson arrives at the Tommy Hilfiger LA Flagship Opening on February 13, 2013 in Los Angeles, California. (Photo by Valerie Macon/Getty Images)

  • Dakota Johnson

    WEST HOLLYWOOD, CA - FEBRUARY 13: Actress Dakota Johnson attends Tommy Hilfiger New West Coast Flagship Opening on Robertson Boulevard on February 13, 2013 in West Hollywood, California. (Photo by Mark Davis/Getty Images for Tommy Hilfiger)

  • Dakota Johnson

    LOS ANGELES, CA - JANUARY 12: Actress Dakota Johnson attends The Art of Elysium's 6th Annual HEAVEN Gala presented by Audi at 2nd Street Tunnel on January 12, 2013 in Los Angeles, California. (Photo by Michael Kovac/Getty Images for Art of Elysium)

  • Dakota Johnson

    LOS ANGELES, CA - JANUARY 12: Actress Dakota Johnson attends The Art of Elysium's 6th Annual HEAVEN Gala presented by Audi at 2nd Street Tunnel on January 12, 2013 in Los Angeles, California. (Photo by Jason Merritt/Getty Images for Art of Elysium)

  • Dakota Johnson

    PASADENA, CA - JANUARY 08: Actress Dakota Johnson arrives at the FOX All-Star Party at the Langham Huntington Hotel on January 8, 2013 in Pasadena, California. (Photo by Kevin Winter/Getty Images)

  • Dakota Johnson

    LOS ANGELES, CA - DECEMBER 01: Model/actress Dakota Johnson attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 1, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

  • Dakota Johnson

    LOS ANGELES, CA - DECEMBER 01: Model/actress Dakota Johnson attends KIIS FM's 2012 Jingle Ball at Nokia Theatre L.A. Live on December 1, 2012 in Los Angeles, California. (Photo by Imeh Akpanudosen/Getty Images)

  • Dakota Johnson

    LOS ANGELES, CA - NOVEMBER 13: Actress Dakota Johnson arrives at the GQ Men of the Year Party at Chateau Marmont on November 13, 2012 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Dakota Johnson

    LOS ANGELES, CA - NOVEMBER 13: Actress Dakota Johnson arrives at the GQ Men of the Year Party at Chateau Marmont on November 13, 2012 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Dakota Johnson

    LOS ANGELES, CA - NOVEMBER 07: Actress Dakota Johnson attends The Hollywood Reporter Toasts The Next Gen Class Of 2012 on November 7, 2012 in Los Angeles, California. (Photo by Alberto E. Rodriguez/Getty Images)

  • Dakota Johnson

    NEW YORK, NY - OCTOBER 26: Actress Dakota Johnson attends a Salute To FOX Comedy on October 26, 2012 in New York City. (Photo by Andrew H. Walker/Getty Images for FOX)

  • Dakota Johnson

    SANTA MONICA, CA - AUGUST 26: Actress Dakota Johnson of Ben and Kate arrives at a screening of Fox TV's new Tuesday night comedies at Santa Monica College's Broad Stage on August 26, 2012 in Santa Monica, California. (Photo by Kevin Winter/Getty Images)

  • Dakota Johnson

    SANTA MONICA, CA - AUGUST 26: Actress Dakota Johnson of Ben and Kate arrives at a screening of Fox TV's new Tuesday night comedies at Santa Monica College's Broad Stage on August 26, 2012 in Santa Monica, California. (Photo by Kevin Winter/Getty Images)

  • Dakota Johnson

    WEST HOLLYWOOD, CA - JULY 23: Actress Dakota Johnson arrives at the FOX All-Star party on July 23, 2012 in West Hollywood, California. (Photo by Kevin Winter/Getty Images)