Music superstar Usher chopped it up with his perfect doppelganger at the Grizzlies vs. Timberwolves game on Tuesday ... hanging out courtside with Ja Morant's dad -- and it was hilarious!!

Of course, fans have been commenting about how the Memphis superstar's pops looks strikingly similar to the "Yeah!" singer throughout the playoffs ... and finally, the two men met face-to-face.

Usher pulled up to Game 5 of the Grizzlies' home game against the Wolves ... and of course, Tee Morant was in the building to support his son Ja, who just won the Most Improved Player Award for this season.

Tee has been making headlines all series -- early on in the playoffs, he enjoyed some friendly back-and-forth with Karl-Anthony Towns' dad, Karl-Anthony Towns Sr. ... and fans couldn't help but notice how much he looked like Usher.

While people swear Tee is Usher's doppelganger, it reached new heights on Tuesday ... when the two wore matching black outfits to the matchup!!

Both twins got to see an incredible game -- with about 6 seconds left on the game clock, Minnesota rising star Anthony Edwards hit a clutch 3-pointer to tie the game at 109-109.

But, Ja would not be denied ... as he beat Edwards to his spot and finished at the rim with a nifty layup over Jarred Vanderbilt ... propelling the Grizzlies to a 111-109 victory.