Watch out what you say about Jennifer Lopez's nipple or any other part of her body, for that matter. The 42-year old has apparently taken up boxing, and V Magazine has the steamy pictures to prove it.

“I know how to fight!” the former fly girl says in the cover story.

She certainly knows how to keep her abs in shape. This is actually the second time in a month that a female singer/actress type has combined boxing and exposed skin -- Meital Dohan stripped down to her gloves, and nothing else, in a video released a couple weeks ago.

Does two make this a trend?  And, if so, are you into this co-mingling of sexiness and the sweet science? A couple more photos from the Lopez shoot should help you work through your feelings on the subject.

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