An NBC Correspondent was arrested last week after allegedly getting wasted at a party thrown by Jerry Sandusky's lawyer ... TMZ has learned. 

The Correspondent -- Jay Gray -- was invited by attorney Joe Amendola to watch the New York Giants game at his house on December 11.  Amendola invited reporters from other media outlets as well, all of whom were vying for an exclusive interview with Sandusky.

One source familiar with the party tells TMZ ... Gray got "really drunk" during the game.  Sometime after midnight, Gray left the party and began driving.  He was stopped by a Pennsylvania State Police officer for a traffic violation, which quickly turned into a DUI stop.   

According to police records obtained by TMZ, "He [Gray] had been drinking and was arrested for DUI."  The time of arrest was 1:45 AM on December 12. 

We left messages for Gray but did not hear back.  Ditto Amendola.

NBC had no comment.