Jessica Alba's movie 'Sin City 2' required her to get in serious shape to reprise her role as Nancy Callahan. Jessica Alba enlisted the help of a dance instructor to get in some pretty intense workouts for the Sin City sequel A Dame To Kill For.

Dance instructor Jennifer "JJ" Johnson, who also choreographed the dance sequences in the movie, would get together with Alba for sessions that ran 2-5 hours at a time and, according to the instructor, included "crawling, arching, humping ... winding, grinding and moving."

'Sin City 2' has an all star cast of Rosario Dawson, Jaime King, Powers Boothe,Mickey Rourke, Bruce Willis, Eva Green,Josh Brolin, Lady Gaga, Jamie Chung, and Joseph Gordon-Levitt. The film was directed by Robert Rodrigeuz and Frank Miller.

'Sin City: A Dame to Kill For' explores the dark and miserable town, Basin City, and tells the story of three different people, all caught up in violent corruption.

'Sin City: A Dame to Kill For' is set for release on August, 2014!

Jessica Alba hosted a fun-filled baby shower for over 30 expectant and new U.S. Navy families on Tuesday June 3 in San Diego, Calif.

The 'Sin City 2' star said, "Growing up in a military family and having many family members in the service, I saw first-hand how tough deployment is on families and the time apart is never easy for either party involved... I am so thrilled to join Operation Shower to reward these brave men and women as a small token of The Honest."

Alba's company, The Honest Company, hosted a fun and emotional product giveaway for attending mothers and every family was gifted a month's supply of Honest Company diapers and wipes.