Russell Westbrook is a real crowd-pleaser ... 'cause the NBA star crashed a high school basketball tourney in New Orleans and had fans LOSING THEIR MINDS!!
Russ -- a Jordan Brand athlete -- popped up at the Jordan Invitational at St. Augustine H.S. in NOLA to check out 4 of the best H.S. hoops teams in the country face off ... but the Thunder hooper clearly stole the show.
Westbrook is in town for All-Star Weekend ... and fellow All-Star Kemba Walker and his teammate, Frank Kaminsky, also made appearances.