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(TMZ) - Is Britney Spears' kid sister is a sandwich shop vigilante ... who didn't hesitate to reach for the closest weapon when her girlfriend got into a brawl with another chick?

TMZ reports the violence broke out last weekend at the Pita Pit in Hammond, Louisiana -- Jamie Lynn Spears and a friend had made a late night stop for food, when ... according to sources close to Jamie ... someone attacked her friend.

Cops tell TMZ Jamie's friend got clocked with a bottle. That's when Jamie reportedly went all Saving Private Ryan ... dragging her friend to safety. TMZ says Jamie pulled her behind the sandwich counter -- then grabbed a long serrated bread knife and started waving it around to stop the fight. 

According to TMZ that did the job. Police showed up, but Jamie's friend didn't want to press charges ... so no one got arrested.


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