Katy Perry sat down with MTV last night for a live chat right after debuting the video for her latest song "Part Of Me".

In the video she enlists in the Marines after seeing her boyfriend flirting with another girl on the job.  She makes the decision after stopping in a convenience store and then ends up in the bathroom cutting off her hair and then in the Marines.

Check out Katy Perry's "Part Of Me" video here.

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