Toronto forward RJ Barrett was so starstruck by a "Game Of Thrones" actor who was sitting courtside at his game in L.A. on Sunday -- he actually briefly paused his play to recognize the guy ... and the scene was hilarious.
It all went down during the Raptors' tilt against the Lakers at Crypto.com Arena ... just after Barrett had been fouled while scoring a basket in the first quarter.
Video from the game's broadcast shows the 24-year-old walk toward some fans in the stands to celebrate his potential 3-point play .