Michael Jackson's Daughter -- Destroyer of Wide Receivers

Like a 13-year-old Mike Singletary ... Paris Jackson was a focused instrument of destruction as a linebacker during a flag football game in L.A. yesterday.

Jackson -- who's the very first female in the history of her private school to join the squad -- also played a little offensive line ... and got STRAIGHT UP PHYSICAL with the boys, throwing some pretty aggressive blocks.

But Paris wasn't the only celebu-spawn on the gridiron ... Oksana Grigorieva and Timothy Dalton were standing on the sidelines to support their son, Alexander, who's also on PJ's team.

Jackson's school emerged victorious ... and after the game, she tweeted about it ... saying, "We Won 32-6!!!!!!!! Yeahhh Boiiiiii!"