Jessica SimpsonDukes of Hazzard star Jessica Simpson proved she’s not one to be messed with, when she beat up one of the extras on the Hazzard set after mistaking him for a stunt man.

The script called for Jessica to break a pool cue over his back, but it wasn’t for snapping:

“I was like: ‘Oh gosh, this is the last shot! I have to break it!’ so I ended up like losing my mind. I just started attacking him and he had welts all over his back,” she confessed to David Letterman on a recent show.

“It finally broke. I kept hitting him until it did.”

Now we know why her husband Nick Lachey always looks so well behaved…