Giveon had royalty present during his concert in LA on Monday ... 'cause the R&B singer brought out Lakers superstar LeBron James in the middle of his show!!
LeBron -- who was enjoying the Lakers' day off -- made a special guest appearance at the L.A. Live concert ... and judging from the reaction of the crowd, everyone was pumped.
The "Heartbreak Anniversary" crooner had to playfully persuade King James to come out and address the crowd ... chanting "LeBron, LeBron. LeBron," before the 4-time champ strolled out on stage.
"Make some noise for LeBron, please," Giveon said.