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Ready for Her Close Up - She’s a pop star and a fashion maven, and on May 18 Rihanna will add actress to the list when she makes her big screen debut in Battleship. (Photo: Courtesy Universal Pictures)

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First Time for Everything - Rihanna dressed up in full Navy uniform and short dark brown hair for her role as weapons officer “Cora Raikes.” Speaking in a behind-the-scenes video, RiRi says she wanted her first role to be "one that I was capable of mastering and performing well in. It was a good challenge.” (Photo: Courtesy Universal Pictures)

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Learning the Ropes - To get ready for her character, Rihanna went through some military training and shadowed real officers to learn military lingo, procedures and how to handle a weapon. (Photo: Courtesy Universal Pictures)

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Bad Girl - “We had this bad-ass chick on set, her name is Jackie, she’s also in the Navy, and I was playing what she does in real life. She’s all tatted up and I looked at her like you are Raikes!”  (Photo: Courtesy Universal Pictures)

5 / 10

Rihanna Got a Gun - Rihanna, who has gotten a gun tattoo in the past, handled a big one on set while in the zone of her character. (Photo: Courtesy Universal Pictures)

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London Calling - Rihanna went conservative in a ladylike olive green Alexander Wang dress with a knee-length hem on March 28 when she attended a photocall for the film on the roof of the Corinthia Hotel in London.  (Photo: Dave Hogan/Getty Images)

7 / 10

Super Star - The singer posed with her Battleship co-star Taylor Kitsch during the London photocall and looked every bit a movie star with her natural makeup and bleach blonde hair, worn wavy with bangs, giving an elegant finish to her look. (Photo: Dave Hogan/Getty Images)

8 / 10

Pose, Click - Rihanna and her co-stars Taylor Kitsch and Brooklyn Decker polished up from their characters war-garb to pose in London. (Photo: Dave Hogan/Getty Images)

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Switch! - While the pop star went demure with her look, her co-star, actress Brooklyn Decker, brought the sexy factor with a mesh cut out dress. (Photo: Dave Hogan/Getty Images)

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Group Hug - Rihanna and her co-stars Taylor Kitsch and Brooklyn Decker pose with Battleship director Peter Berg. (Photo: Dave Hogan/Getty Images)

Photo By Photo: Dave Hogan/Getty Images