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Don’t cheat on Katy Perry or she’ll go G.I. Jane on your ass!

The “California Girls” singer takes us behind-the-scenes of her video for her “Part Of Me” Billboard smash.

Katy’s military action happens at Camp Pendleton Marine Corp base in Oceanside, California.

NEW VIDEO: Katy Perry “Part Of Me”!

In the making of the video, Katy Perry rocks a short black cut and army fatigues.

Katy learned how to properly shoot a gun, perform combat techniques, and engage in rigorous military activity.

PHOTOS: Katy Perry Covers Teen Vogue!

The whole behind the scenes video of Katy becoming a Marine looks daunting, but Perry keeps up the humor with a mud mustache and a smile on her face.

Semper Fi to Katy Perry!

You can check out the making of the “Part Of Me” music video above!

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