Guess Which NBA Baller Is Now DATING Rapper Trina And They're Pretty SERIOUS TOO!!!

NBA star James Harden of the Oklahoma City Thunder and rapper Trina are dating - and it's serious.

According to very "in-the-know" sources, James has been COURTING Trina since this summer. He's bought her GIFTS, flown cross country to be near her . . . and wined and dined the beautiful Trina. And now Trina's HEAD-OVER-HEELS in love with James.

They make a nice looking couple. And the way James has been BALLING lately . . . he's sure to be making BIG DOLLARS for the rest of his career.