LeBron James -- Gettin' Some Dome Work ... In Beverly Hills

The royal cranium has been pampered, Your Highness.

LeBron James has landed in L.A. to take on the Lakers Thursday night -- but before the game, The King found a few minutes for some "me time" in Beverly Hills.

James and his posse stopped in to Bella Nails -- where a team of beauticians rubbed down his head and gargantuan feet.

LeBron LOOOVVEESS this particular nail salon -- and brought a bunch of his old teammates with him last year back when he was with the Miami Heat.