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Jamie Lynn Spears, Knife

TMZ

Jamie Lynn Spears went to pretty extreme measures last month to break up a fight.

Britney Spears' younger sister was grabbing a bite to eat with a friend at the Pita Pit in Hammond, La., when a fight suddenly broke out in the middle of the restaurant.

Jamie Lynn quickly helped her friend from out of the middle of the violent group and ran behind the counter to grab a massive serrated knife in an effort to keep the peace and stop the brawl.

And now, TMZ has obtained the shocking video of the singer from what appears to be restaurant surveillance footage.

Jack J. Brighenti, the owner of the Hammond Pita Pit location, told E! News that he was in complete shock after the dramatic incident.

"I have been with Pita Pit for several years, and have never seen anything like this before," he explained to us at the time.

"The events that happened occurred after 2 a.m. this past Saturday night just before we closed. A group of males got into an altercation and for some reason Jamie Lynn Spears ran behind the counter and picked up a bread knife."

Brighenti continued, "Our management called the police immediately and thankfully nothing else happened. Our passion and focus is and always will be to serve the Hammond community healthy pitas!"

Jamie Lynn has yet to address the matter on social media, and as of this morning was busy posting healthy recipes and positive quotes on her Twitter page.