Not many people can say the best hoops player on the planet sang his heart out for their birthday ... but that's exactly what LeBron James did for Anthony Davis on his big day!!!
... and the vid is hilarious!!!
The Brow is officially 27 years old on Wednesday ... and LBJ made sure his teammate knew he didn't forget about AD's cake day ... belting out a special rendition of "Happy Birthday" in the locker room.
"Happy birthday, AD ... happy birthday, homie ... happy birthday, my guy guy-y-y-y-y" the King sang with all his might.