According to TMZ, the action took place at a Pita Pit in Louisiana, where Jamie's friend ended up in a fight. When someone hit Jamie's pal with a bottle, Jamie moved her wounded friend behind the sandwich counter. Then she grabbed a knife, courtesy of Pita Pit, and used it to fend off the assailants. Apparently no one was arrested in the encounter and no one pressed charges.
Report: Jamie Lynn Spears Breaks Up Fight With a Bread Knife