Deena's Parents -- Get Your Ass Outta Jail!!!!

Deena Nicole Cortese is a free woman ... the "Jersey Shore" starlet was seen leaving a NJ jail with her mommy and daddy by her side yesterday after she was busted for disorderly conduct.

TMZ broke the story ... Deena was arrested in Seaside Heights on Sunday afternoon after allegedly acting like a drunken buffoon in the middle of the street and blocking the flow of traffic.

After Deena was taken to the pokey, she got a visit from a few of her MTV costars -- including Ronnie, Jwoww, Sammi and Snooki.

Eventually Deena's parents walked the reality star out of the big house -- with her dad giving her the look of disappointment.