Matt Barnes & Gloria Govan -- Last Movie Scene Together Before Split ... Now Super Awkward

Well, this is awkward ... Matt Barnes cracking a marriage joke directed at his wife just weeks before they split up -- but it was all scripted for a movie scene they were doing together ... and TMZ Sports has the footage.

Just a few months ago, Matt and Gloria Govan got together to film a cameo in the upcoming movie "Chocolate City" ... all about the life of a black male exotic dancer.

During the scene, Matt plays a guy who's at a female strip club with his buddies ... and Gloria plays their sassy hot waitress.

The two sides exchange quips -- and Matt eventually fires off a barb at Gloria ... saying, "With that attitude you ain't never getting married."

Yeesh.

As we previously reported, Matt and Gloria separated a short time later ... and now it seems their headed for divorce.