Sneak Peek! Rihanna's 'Hard' Video

Rihanna's new video "Hard" premieres Thursday, and "Extra" has a sneak peek!

See photos of Rihanna's wackiest outfits

In the clip, the pop star has enlisted in the military -- and she isn't afraid to use her machine gun! Rihanna, 21, also opens up her fatigue shirt to flash the camera. Take a look at the video, directed by Melina.